• python 学习_第五模块 javascripts


    python 学习_第五模块 javascripts

    1 js的基本数据类型

    //  1number 数值类型
    var a = 3;
    var b = 1.23;
    var c = -123;
    var d = 0;
    alert(typeof a); //number
    alert(typeof b); //number
    alert(typeof c); //number
    alert(typeof d); //number
    
    // 2 string 类型
    var a = "aaaaa";
    alert(typeof a);
    
    
    // Boolean
    var c = 3<=4;
    alert(c)  // true
    alert(typeof c) // boolean
    
    
    //undefined
    var x;
    alert( x) //undefined
    alert(typeof x)  //undefined
    
    
    //空对象
    var y = null;
    alert(y);   // null
    alert(typeof y); //object

    2 js的加 减 乘 取余 除

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>运算符</title>
    </head>
    <body>
        <script type="text/javascript">
            var x = 10;
            var y = 3;
            var sum  = x + y;
            alert(sum) // 13
    
            // +  -  *  %     /   
            // 加 减 乘  取余  除
    
            var test1  = x % y;
            alert(test1) //1
        </script>
    </body>
    </html>

    3 js的递增 递减 

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>递增递减</title>
    </head>
    <body>
        <script type="text/javascript">
            var x = 4;
            // x = x + 1;
            // x +=1;
            x++;
            alert (x);// 5
    
            var c = 10;
            c += 5;
            c -= 2;
            c *= 4;
            c /= 3;
            alert(c);
    
        </script>
    </body>
    </html>

    4 js的字符串

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>字符串</title>
    </head>
    <body>
        <script type="text/javascript">
            var  str1 = "one";
            var  str2 = "two";
    
            var joined = str1 + ' ' + str2 + 'san'
            alert(joined) //one twosan
        </script>
    </body>
    </html>

    5 js的数值与字符串

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>数字和字符串</title>
    </head>
    <body>
        <script type="text/javascript">
            //1  当数字和字符串相加时, 数字也会转换成字符串
            var a = "123" + 456
            alert(a) // 123456
            alert(typeof a) // string
    
            // 2 隐式
            var num = 234;
            var myStr = num + '';
            alert(typeof myStr ); // string
    
            // 3 toString()  数字转字符串
            var myStr2 = num.toString();
            alert(typeof myStr2);  // string
    
            // 字符串转数值
            var a = "123" 
            var myNum = Number(a);
            alert(typeof myNum) //number
    
        </script>
    </body>
    </html>

    6 js的数组

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>数组Array</title>
    </head>
    <body>
        <script type="text/javascript">
            var shopping = ['香蕉','苹果','牛奶','红牛']; 
            // alert(typeof shopping)  //object
            var rand = ['tree','345',[1,2,3]];
    
            // 访问
            var item1 = rand[0];
            console.log(item1);  // tree
    
            rand[0] = '榴莲';
            console.log(rand);
    
            var a = rand[2][2];
            console.log(a);  //3
    
            // 访问数组的长度 for
            console.log('数组的长度是:' + rand.length);  // 数组的长度是:3
        </script>
    </body>
    </html>

    7 js的条件判断

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>条件判断</title>
    </head>
    <body>
        <script type="text/javascript">
            var weather = 'rainy';
    
            if (weather ==='rainy' ) {
                console.log('天气下雨了,在家里呆着');
            }
            else if (weather ==='sunny' ) {
                console.log('天气非常棒,可以出去玩耍')
            } 
            else if (weather ==='snowing' ) {
                console.log('天气下雪了,可以出去滑雪')
            } 
            else {
                console.log('输入的天气有错,重新输入');
            }
        </script>
    </body>
    </html>

    8 js的比较运算符

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>比较运算符</title>
    </head>
    <body>
        <script type="text/javascript">
    
            // === !==  ==  !=
    
            var a = 5;
            var astr = '5';
            var isequal = a === astr;
            console.log(isequal)  // false
    
           console.log(4 <= 4);
        </script>
    </body>
    </html>

    9 js的逻辑运算符

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>比较运算符</title>
    </head>
    <body>
        <script type="text/javascript">
            var weaher = 'sunny';
            var temp = 22;
        //  && 逻辑或 并且      || 逻辑或   !true
    
           // &&
            if (weaher ==='sunny' && temp >30) {
                console.log('在家里吹空调,吃西瓜');
            }
            else if (weaher ==='sunny' && temp <=30){
                console.log('天气不错 可以出去玩')
            }
    
            // ||
            var mathscore = 77;
            var englishscore = 80;
            if (mathscore >=80 || englishscore >=85) {
                console.log('可以出去玩')
            }
            else
                {   console.log('在家写作业')}
    
            // false
            var  islogin = false;
            alert(!islogin);
    
            if (!islogin) {
                console.log('用户已登录')
            }
    
        </script>
    </body>
    </html>

    10 switch 语句 

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>switch语句</title>
    </head>
    <body>
        <script type="text/javascript">
        var weather = 'rainy';
        switch(weather) {
            case 'summy':
                alert(1);
                break;
            case 'rainy':
                alert(2);
                //  编写 switch语句  小心break  case 穿透
                break;
            case 'snowing':
                alert(3);
                break;
            default:
                alert(4);
                break;
        }        
        </script>
    </body>
    </html>

    11 三元运算符

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>三元运算符</title>
    </head>
    <body>
        <script type="text/javascript">
        var result = 1 < 2 ?  '真的' : '假的';
        alert(result)  
        </script>
    </body>
    </html>

    12 for循环

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>for 循环</title>
    </head>
    <body>
        <script type="text/javascript">
            var i;
            var sum = 0;
            for (i =1; i <= 100; i++){
                sum += i;
            }
            console.log(sum); //5050
    
    
            var shopping = ['香蕉','苹果','牛奶','红牛'];
            var j;
            for (j = 0; j <shopping.length; j++) {
                var htmlstr = '<h1>' + shopping[j] + '</h1>'
                console.log(htmlstr);
                document.write(htmlstr);
            }
    
    
        </script>
    </body>
    </html>

    13 break和continue

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>break和continue</title>
    </head>
    <body>
        <script type="text/javascript">
            // break
            var x = 0;
            for (;;){
                if (x > 100){
                    break
                }
                x++;
            }
           alert(x);          
           
           //continue
            var sum = 0;
            for (var i = 1; i <=10; i++) {
                if (i ===8) {
                    continue;
                }
                sum = sum + i;
            }
            alert(sum)
    
        </script>
    </body>
    </html>

    14 while循环 

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>while循环</title>
    </head>
    <body>
        <script type="text/javascript">
            
            var sum = 0;  //计算的和
            var  n  = 99; //初始的奇数
            while (n > 0) {
                sum += n;
                n -= 2;
            }
            alert(sum);
            
            // do while  先执行一次, 再判断
            var sum = 0;
            var i = 1;
            do {
                sum  = sum + i;
                i ++;
                console.log(sum);
                alert(sum);
            } while (i <=1);
    
        </script>
    </body>
    </html>

    15 函数

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>函数</title>
    </head>
    <body>
        <script type="text/javascript">
            function test(isbad ){
                alert(isbad);
                
                if (isbad){
                    alert('点个外卖');
                }
                else {
                    alert('做饭了')
                }
            }
            var bad = false;
            test(bad);
        </script>
    </body>
    </html>

    16 函数返回值和函数表达式

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>函数返回值和函数表达式</title>
    </head>
    <body>
        <script type="text/javascript">
            function add(a,b){
                var sum = a+b;
                return sum 
            }
            function sub(a,b){
                return a-b;
            }
            function mult(a,b){
                return a*b;   
            }
            // function div(a,b){
            //     return a/b;
            // }
    
             // 函数表达式 
            var div = function(a,b) {
                return a/b;
            }
    
    
            var  r= add(3,2);
            var  r2= sub(3,2);
            var  r3= mult(3,2);
            var  r4= div(3,2);
    
            console.log(r);
            console.log(r2);
            console.log(r3);
            console.log(r4);
    
        </script>
    </body>
    </html>

    17 函数作用域

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>函数作用域</title>
    </head>
    <body>
        <script type="text/javascript">
            var a = 1;
            function add(){
                var b = 3;
                console.log(a);
            }
            add();
            // console.log(b);
        </script>
    </body>
    </html>

    2

    first.js

    (function(){
        var name = 'ysl';
        var hello = function (){
            alert('hello ' + name);
        }
        window.first = hello;
    })();

    second.js

    (function(){
        var name = 'jack';
        var hello = function(){
            alert('hello ' + name);
        }
        window.second = hello;
    })();
    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>函数作用域</title>
    </head>
    <body>
        <script type="text/javascript"  src="js/first.js"></script>
        <script type="text/javascript"  src="js/second.js"></script>
        <script type="text/javascript">
            console.log(window);
            first();
            second();
        </script>
    </body>
    </html>

    18 对象

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>object</title>
    </head>
    <body>
        <script type="text/javascript">
            var person = {
                name: 'ysl',
                age: 18,
                sex:'',
                fav : function(a) {
                    alert('爱好姑凉')
                    return '姑凉' + a + ''
                }
            }
            console.log(person);
            console.log(person.name);
            console.log(person.fav(18));
        </script>
    </body>
    </html>

    19  js内置函数

    <!DOCTYPE html>
    <html>
    <head>
        <title>js常用的内置对象</title>
    </head>
    <body>
        <script type="text/javascript">
            var colors = new Array();
            // var colors = [];
            var colors2 = [];
            document.write('1111');
    
            //  js 提供构造函数
            var  colors = new Array();
            var colors2 = [];
            if (Array.isArray(colors)) {
                colors[0] = 'red';
                colors[1] = 'blue';
                colors[2] = 'yellow';
                var a = colors.toString();
                console.log(a);
                console.log(typeof a);
                console.log(colors);
            }
        </script>
    </body>
    </html>

    20  数组的方法

    1 map filter forEach

    <!DOCTYPE html>
    <html>
    <head>
        <title>map filter forEach</title>
    </head>
    <body>
        <script type="text/javascript">
            // filter 方法
            var numbers = [1,2,10,7,5,11,44];
            var filterResult = numbers.filter(function(item,index,array){
                console.log(item);
                console.log(index);
                console.log(array);
    
                return item > 10;
            });
            console.log(filterResult);
    
            // map()  方法
            var mapresult = numbers.map(function(item,index,array){
                    return item *2;
            })
            console.log(mapresult);
    
            for (var i = 0; i < mapresult.length; i++){
                console.log(mapresult[i]);
            }
    
            // forEach
            mapresult.forEach(function(item,index){
                console.log(item);
            })
    
        </script>
    </body>
    </html>

    2) 数组常用的方法

    <!DOCTYPE html>
    <html>
    <head>
        <title>数组常用的方法</title>
    </head>
    <body>
        <script type="text/javascript">
            var arr = [1,2,3];
            var a = arr.toString(); // 变成string  1,2,3
            var b = arr.toLocaleString(); //1,2,3
            console.log(a);
            console.log(b);    
    
    
            var person1 = {
                toLocaleString: function(){
                    return 'mjj';
                },
                toString:function(){
                    return '么挤挤';
                }
            }
    
            var person2 = {
                toLocaleString: function(){
                    return '隔壁老王';
                },
                toString:function(){
                    return '隔壁老李';
                }
            }        
    
            var people = [person1,person2];
            console.log(people);
            console.log(people.toString());       //么挤挤,隔壁老李
            console.log(people.toLocaleString()); //mjj,隔壁老王
    
    
    
        </script>
    </body>
    </html>

    3)数组常用的方法

    <!DOCTYPE html>
    <html>
    <head>
        <title>数组常用的方法</title>
    </head>
    <body>
        <script type="text/javascript">
            // 分割字符串
            var colors = ['red','blue','green'];
            var a = colors.join('|');
            console.log(a); //red|blue|green
    
    
    
            // 栈 lifo  push()   pop()  队列方法
            // push 相当于 Python的append
            var newlength = colors.push('purple');
            console.log(newlength); //4
            console.log(colors); // (4) ["red", "blue", "green", "purple"]
    
            // pop() 从数组末尾删除最后一项
            var lastItem  = colors.pop();
            console.log(lastItem); //purple
            console.log(colors); // (3) ["red", "blue", "green"]
    
    
    
    
              //  队列fifo 先进先出  unshift()  shift()
              newlength = colors.unshift('yellow');
              console.log(newlength);  //4
              console.log(colors); //(4) ["yellow", "red", "blue", "green"]
    
              var firstItem = colors.shift();
              console.log(newlength);  //4
              console.log(colors);     //  (3) ["red", "blue", "green"]
    
    
              // 数组倒序
              var values = [0,3,2,16,15,10];
              function compare1(a,b){
                  return a -b;
              };
    
              function compare2(a,b){
                  return b -a ;
              };
              values.sort(compare1); //升序
              console.log(values);  //[0, 2, 3, 10, 15, 16]
    
              values.sort(compare2);//降序
            console.log(values); //[16, 15, 10, 3, 2, 0]
    
        </script>
    </body>
    </html>

    4 )数组常用的方法

    <!DOCTYPE html>
    <html>
    <head>
        <title>数组常用的方法</title>
    </head>
    <body>
        <script type="text/javascript">
            // 操作方法 concat()  slice() splice()
            // 1 concat 数组合并
            var colors = ['red','blue'];
            // var newColors = colors.concat('green');
            newColors = colors.concat({name:'zhangsan'});
            console.log(newColors);
    
            // 2 slice()
            var colors = ['red','blue','yellow'];
            newcolors = colors.slice(1,2); // ["blue"]
            console.log(newcolors);
    
            //  3 splice()   删除 插入 替换
            // 3.1 删除
            var names = ['张三','李四','mjj','alex'];
            // names.splice(0,2);
            // console.log(names); //["mjj", "alex"]
    
            // 3.2  插入
            // names.splice(1,0,'熊大大','jack');
            // console.log(names); //["张三", "熊大大", "jack", "李四", "mjj", "alex"]
    
            //3.3 替换
            names.splice(1,1,'xiongdada');
            console.log(names); //["张三", "xiongdada", "mjj", "alex"]
    
            // 4 位置方法   indexOf()   lastIndexOf()
            var names = ['张三','mjj','王五','mjj','赵六'];
            alert(names.indexOf('mjj')); //1
            alert(names.lastIndexOf('mjj')); //3
            alert(names.indexOf('mjj',2)); //3
            alert(names.lastIndexOf('mjj',2)); //1
            alert(names.lastIndexOf('mjjxxxx',2)); //如果查不到结果 返回-1
    
        </script>
    </body>
    </html>

    21 map方法应用

    <!DOCTYPE html>
    <html>
    <head>
        <title>map方法应用</title>
    </head>
    <body>
        <script type="text/javascript">
            var oldArray = [
                {
                    name:'张三',
                    age: 17
                },
                {
                    name:'mjj',
                    age: 29
                },
                {
                    name:'李四',
                    age: 30
                }
            ]
            var newNames = oldArray.map(function(item,index){
                return item.name
                })
            var newAges = oldArray.map(function(item,index){
                return item.age
                })
            console.log(newNames);
            console.log(newAges);
     
    
        </script>
    </body>
    </html>

    22 字符串常用方法

    <!DOCTYPE html>
    <html>
    <head>
        <title>字符串的常用方法</title>
    </head>
    <body>
        <script type="text/javascript">
            var str = 'hello world';
            console.log(str.length);    // 11
            console.log(str.charAt(1)); //e 
            console.log(str.charCodeAt(1)) //101 获取指定的字符对应的编码
            console.log(str.concat(' mjj',' jack')); //拼接字符串  通常情况不适用它来做拼接,使用 +来做多个字符的拼接
     
             console.log(str.slice(2)); // llo world
            console.log(str.substring(2)); // llo world
            console.log(str.substr(2)); //  llo world
    
            console.log(str.slice(2,4));  // ll
            console.log(str.substring(2,4)); // ll
    
    
            var str = 'hello world';
            console.log(str.indexOf('o')); //4
            console.log(str.lastIndexOf('o')); //7
            console.log(str.indexOf('o',6)); //7
            console.log(str.lastIndexOf('o',6)); //4
    
            // trim()清除当前 字符串的前后后格
            var str = '       hello world       ';
            console.log(str.trim()); //hello world
            console.log(str);          //        hello world      
            var str = 'Hello Mjj';
            console.log("------",str.toLowerCase()); //hello mjj
        </script>
    </body>
    </html>

    23 字符串查找

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>查找当前字符e在字符串中的所有位置</title>
    </head>
    <body>
        <script type="text/javascript">
            // 查找e 在str中的所有的位置
            var str = 'He unfolded the map and set it on the floor.';
            var arr = [];
            var pos = str.indexOf('e'); //1
            console.log(pos);
            while(pos > -1){
                // 找到当前e字符对应的位置
                arr.push(pos);
                pos = str.indexOf('e',pos+1);
            }
            console.log(arr);
        </script>
        
    </body>
    </html>

    24 date

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>date日期对象</title>
    </head>
    <body>
        <script type="text/javascript">
    
            /*
            // 1.四种方式创建
            var now = new Date();
            console.log(now);  //Tue Jul 23 2019 11:48:08 GMT+0800 (中国标准时间)
            var xmas = new Date('December 25,1995 13:30:00');
            console.log(xmas); //Mon Dec 25 1995 13:30:00 GMT+0800 (中国标准时间)
            var xmas = new Date(1995,11,25);
            console.log(xmas); //Mon Dec 25 1995 00:00:00 GMT+0800 (中国标准时间)
            var xmas = new Date(1995,11,25,14,30,0);
            console.log(xmas); //Mon Dec 25 1995 14:30:00 GMT+0800 (中国标准时间)
            */
            var now = new Date();
            // 常用方法
            console.log(now.getDate()); //获取月份的第几天 (1~31)
            console.log(now.getMonth()); //获取月份 (0~11)
            console.log(now.getFullYear()); //获取年份
            console.log(now.getDay()); //获取一星期中的第几天(0 ~ 6)
            console.log(now.getHours()); //获取小时(0~23);
            console.log(now.getMinutes()); //获取分钟(0~59);
            console.log(now.getSeconds()); //获取秒(0~59);
    
            // 日期格式化方法
            console.log(now.toDateString()); //星期几  月 日  年
            console.log(now.toTimeString()); //时 分 秒 时区
    
            // 常用
            console.log(now.toLocaleDateString()); // 
            console.log(now.toLocaleTimeString()); //
            console.log(now.toLocaleString());
    
    
            console.log(now.toUTCString());
    
    
        </script>
        
    </body>
    </html>
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>返回用数字时钟格式的时间</title>
    </head>
    <body>
        <script type="text/javascript">
            // 6:27:35 P.M.
            // 6:30:01 P.M.
            // 6:04:01 A.M.
            // :0    4
            //  :   30
            
            function nowNumTime(){
                var now = new Date();
                var hour  = now.getHours(); //0 ~ 23.   //19
                var minute = now.getMinutes();
                var second = now.getSeconds();
                // 18 > 12  ? 18-12  : 8
                var temp = '' + (hour > 12 ?  hour - 12 : hour);
                if(hour === 0){
                    temp = '12';
                }
                temp  = temp +(minute < 10 ?  ':0': ":")+ minute;
                temp  = temp +(second < 10 ?  ':0': ":")+ second;
                temp = temp + (hour >= 12 ?  ' P.M.': " A.M.");
                return temp;
            }
            var nownum = nowNumTime();
            console.log(nownum);
        </script>
        
    </body>
    </html>

    25 字符串和数值相互转换

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>字符串和数值相互转换</title>
    </head>
    <body>
        <script type="text/javascript">
            var str = '13131.9090013';
            // 字符串转数值类型
            console.log(parseInt(str)); //13131
            console.log(parseFloat(str)); //13131.9090013
            console.log(typeof parseFloat(str)); //number
            var a  = Number(str); 
            console.log(isNaN(a)); //NaN   false
    
            var  num = 1313.179;
            // 强制类型转换
            console.log(num.toString()); //string
            console.log(typeof num.toString()); //1313.179
            console.log(String(num)); //1313.179
    
            // 隐式转换
            console.log('' + num); //1313.179
            console.log(''.concat(num)); //1313.179
            console.log(Number(num.toFixed(2))); //1313.18
    
        </script>
    </body>
    </html>

    26 Globle对象

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Globle对象</title>
    </head>
    <body>
        <script type="text/javascript">
            // URI
            var uri = 'http://www.apeland.cn/web index.html?name=zhangsan';
            // encodeURIComponent()编码 使用最多的方法
            console.log(encodeURI(uri)); 
            console.log(encodeURIComponent(uri));
            
            // 解码 decodeURIComponent()
            // decodeURI(encodeuri);
            // decodeURIComponent(encodeuri);
    
        </script>
        
    </body>
    </html>

    27 Math对象

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Math对象</title>
    </head>
    <body>
        <script type="text/javascript">
            // Math
            // var a = 3;
    
            // 方法  min() max()
            var max = Math.max(3,34,56,21);
            var min = Math.min(3,34,56,21);
    
            var arr = [1,2,32,23,45,21];
            var max = Math.max.apply(null,arr);
            var min = Math.min.apply(null,arr);
    
            // var max=  Math.max(arr[0],arr[1],arr[2]);
            console.log(max);
            console.log(min);
    
    
            // ceil()  floor() round()
            var num = 24.8;
            console.log(Math.ceil(num)); //天花板函数 向上取整
            console.log(Math.floor(num)); //地板函数 向下取整
            console.log(Math.round(num)); //标准的四舍五入
    
    
            // 随机数 random()     0 <= random<1
            console.log(Math.random());
    
            // 1.获取min到max之间的整数
    
            // 2.获取随机颜色  rgb(0~255,0~255,0~255);
    
            // 3.随机验证码   四位  数字+ 字母 (大写)
    
    
    
        </script>
    </body>
    </html>

    28 练习

    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>练习</title>
    </head>
    <body>
        <script type="text/javascript">
            
            // 1.获取min到max之间的整数 (1~100)
            function random(max,min){
                return Math.floor(Math.random() * (max-min) + min);
            }
    
            // 2.获取随机颜色  rgb(0~255,0~255,0~255);
            function randomColor(){
    
                // var result
                var r = random(0,256),g = random(0,256),b = random(0,256);
                // 模板字符串 ``
                var result = `rgb(${r},${g},${b})`;
                return result;
            }
            var rc = randomColor();
            console.log(rc);
            document.body.style.backgroundColor = rc;
    
    
            // 3.随机验证码   四位  数字+ 字母 (大写) 65Yz
            function creatCode(){
                // 设置默认的空的字符串  
                var  code = '';
                // 设置长度 
                var codeLength = 4;
                var randomCode = [0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R', 'S','T','U','V','W','X','Y','Z'];
                for(var i  = 0; i < codeLength; i++){
                    // 设置随机范围 0~36
                    var index = random(0,36);
                    code +=  randomCode[index];
                }
                return code;
            }
            var rndcode = creatCode();
            console.log(rndcode);
            document.write(`<h1>${rndcode}</h1`)
    
        </script>
        
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/augustyang/p/11206997.html
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