• javascript中function和object的区别,以及javascript如何实现面向对象的编程思想.


     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function aa() {
     8             window.alert("aa");
     9         }
    10         var bb = function () {
    11             window.alert("bb");
    12         }
    13         var cc = new Function("window.alert('cc');");
    14         window.alert(typeof cc);
    15     </script>
    16 </head>
    17 <body>
    18 
    19 </body>
    20 </html>
    fun01
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function fn1() {
     8             window.alert("fn1");
     9         }
    10 
    11         //fn1();
    12         var fn2 = fn1;
    13 
    14         fn2();
    15 
    16         fn1 = function () {
    17             window.alert("new fn1");
    18         };
    19 
    20         fn2();
    21 
    22         fn1();
    23 
    24     </script>
    25 </head>
    26 <body>
    27 
    28 </body>
    29 </html>
    fun02
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function sum1(a, b) {
     8             return a + b;
     9         }
    10         function sum1(a) {
    11             return a + a;
    12         }
    13         //window.alert(sum1(4, 5));
    14         window.alert(sum1(4,5));
    15 
    16     </script>
    17 </head>
    18 <body>
    19 
    20 </body>
    21 </html>
    fun03
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title>function 参数</title>
     6     <script language="javascript" type="text/javascript">
     7         function callFun(fun, arg) {
     8             return fun(arg);
     9         }
    10 
    11         function say(name) {
    12             window.alert(name);
    13         }
    14 
    15         //say("wyp");
    16         callFun(say, "wyp");
    17 
    18         function say(name) {
    19             window.alert("new " + name);
    20         }
    21         callFun(say, "wyp");
    22 
    23         var cc = new Function("name", "say(name)");
    24         cc("wangyp");
    25 
    26 
    27 
    28         var ss = [1, 2, 11, 13, 12, 119];
    29         window.alert(ss);
    30         ss.sort(sortBy);
    31         window.alert(ss);
    32 
    33         function sortBy(a, b) {
    34             return a - b;
    35         }
    36     </script>
    37 </head>
    38 <body>
    39 
    40 </body>
    41 </html>
    fun04
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     5     <title>function 返回值</title>
     6     <script language="javascript" type="text/javascript">
     7         //function fn1(a) {
     8         //    var fnn1 = function (b) {
     9         //        return a + b;
    10         //    }
    11         //    return fnn1;
    12         //}
    13         //var fn11 = fn1(3);
    14         //window.alert(fn11(4));
    15 
    16         function compareProp(prop) {
    17             var fn1 = function (obj1, obj2) {
    18                 if (obj1[prop] > obj2[prop]) return 1;
    19                 else if (obj1[prop] < obj2[prop]) return -1;
    20                 return 0;
    21             }
    22             return fn1;
    23         }
    24 
    25         var person1 = { name: 'wyp', age: 33 };
    26         var person2 = { name: 'zyx', age: 23 };
    27         var person3 = { name: 'hg', age: 27 };
    28         var persons = [person1, person2, person3];
    29         //for (var i = 0 ; i < persons.length; i++) {
    30         //    window.alert(persons[i].name + "," + persons[i].age);
    31         //}
    32         var comparePropFun = compareProp("name");
    33         persons.sort(comparePropFun);
    34         for (var i = 0 ; i < persons.length; i++) {
    35             window.alert(persons[i].name + "," + persons[i].age);
    36         }
    37     </script>
    38 </head>
    39 <body>
    40 
    41 </body>
    42 </html>
    fun05
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         //function fn() {
     8         //    window.alert(arguments.length);
     9         //    var result = 0;
    10         //    for (var i = 0 ; i < arguments.length ; i++) {
    11         //        result += arguments[i];
    12         //    }
    13         //    return result;
    14         //}
    15 
    16         //window.alert(fn(1, 3, 5));
    17 
    18 
    19         function sum(num) {
    20             if (num == 1) {
    21                 return 1;
    22             }
    23             else {
    24                 return num * arguments.callee(num - 1);
    25                 //return num * sum(num - 1);
    26             }
    27         }
    28         //window.alert(sum(3));
    29 
    30         var fn = sum;
    31         sum = null;
    32         window.alert(fn(3));
    33 
    34     </script>
    35 </head>
    36 <body>
    37 
    38 </body>
    39 </html>
    fun06
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function Person(name, age) {
     8             this.name = name;
     9             this.age = age;
    10         }
    11         window.alert(typeof Person);
    12         var person = new Person("wyp",33);
    13         //person.name = "wyp";
    14         window.alert(typeof person);
    15         window.alert(person.name);
    16 
    17 
    18         //function Person(name, age) {
    19         //    window.alert(arguments.length);
    20         //}
    21 
    22         //window.alert(Person.length);
    23         //Person(10);
    24     </script>
    25 </head>
    26 <body>
    27 
    28 </body>
    29 </html>
    fun07
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         var person1 = { name: "wyp", age: 33 };
     8         var person2 = { name: "cr", age: 29 };
     9 
    10         function show(a, b) {
    11             window.alert("name=" + this.name + ",a=" + a + ",b=" + b);
    12         }
    13         show(3, 4);
    14         show.apply(person1, [3, 4]);
    15         show.call(person2, 3, 4);
    16     </script>
    17 </head>
    18 <body>
    19 
    20 </body>
    21 </html>
    fun08
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         var person = '{ name: "wyp", age: 32 }';
     8         //var obj = eval("(" + person + ")");
     9         var obj = new Function("return " + person)();
    10         window.alert(obj.name);
    11     </script>
    12 </head>
    13 <body>
    14 
    15 </body>
    16 </html>
    json1
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         //var aa = new Array();
     8         //var aa = new Object();
     9         var aa = {
    10 
    11         };
    12 
    13         aa[0] = "wyp";
    14         aa[1] = "wangyunpeng";
    15         aa.name = "shuaige";
    16         //aa["name"];
    17         //aa.name;
    18         window.alert(aa[1]);
    19     </script>
    20 </head>
    21 <body>
    22 
    23 </body>
    24 </html>
    obj01
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         var person = { name: "wyp", age: 32 };
     8         person.sex = true;
     9         window.alert(person.name);
    10 
    11     </script>
    12 </head>
    13 <body>
    14 
    15 </body>
    16 </html>
    obj02
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         //var obj1 = { name: 'wyp' };
     8         //var obj2 = obj1;
     9         //window.alert(obj2.name);
    10         //obj1.name = "wangyunpeng";
    11         //window.alert(obj2.name);
    12 
    13         var obj = { name: "ddd" };
    14 
    15     </script>
    16 </head>
    17 <body>
    18 
    19 </body>
    20 </html>
    obj03
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         //var person = new Object();
     8         //person.name = 'wyp';
     9         //person.age = 33;
    10         //person.say = function () {
    11         //    window.alert(this.name);
    12         //}
    13         //person.say();
    14 
    15         var person = {
    16             name: "wyp",
    17             age: 33,
    18             say: function () {
    19                 window.alert(this.name);
    20             }
    21         }
    22         person.say();
    23     </script>
    24 </head>
    25 <body>
    26 
    27 </body>
    28 </html>
    obj04
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         var Person = function () {
     8 
     9         };
    10 
    11         var person = new Person();
    12         window.alert(person instanceof Person);
    13     </script>
    14 </head>
    15 <body>
    16 
    17 </body>
    18 </html>
    obj05
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function Person(name ,age) {
     8             this.name = name;
     9             this.age = age;
    10             this.say = function () {
    11                 window.alert(this.name);
    12             }
    13         }
    14         var person1 = new Person("wyp", 33);
    15         var person2 = new Person("hg", 29);
    16         window.alert(person1.say == person2.say);//false
    17 
    18         person1.say = function () {
    19             window.alert(this.age);
    20         }
    21         person1.say();
    22 
    23         person2.say();
    24 
    25     </script>
    26 </head>
    27 <body>
    28 
    29 </body>
    30 </html>
    obj06
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function Person() {
     8 
     9         }
    10         Person.prototype.name = "wyp";
    11         Person.prototype.age = 33;
    12         Person.prototype.say = function () {
    13             window.alert(this.name);
    14         }
    15 
    16         var person1 = new Person();
    17         var person2 = new Person();
    18         person2.name = "hg";
    19         person2.age = 29;
    20         person1.say();
    21         person2.say();
    22     </script>
    23 </head>
    24 <body>
    25 
    26 </body>
    27 </html>
    obj07
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function Person() {
     8 
     9         }
    10         Person.prototype = {
    11             constructor: Person,
    12             name: "wyp",
    13             age: 33,
    14             works: ['gh', 'zyx'],
    15             say: function () {
    16                 window.alert(this.name + ",[" + this.works + "]");
    17             }
    18         };
    19         var person1 = new Person();
    20         person1.name = "wyp";
    21         person1.works.push("db");
    22         person1.say();
    23 
    24         var person2 = new Person();
    25         person2.name = "sl";
    26         person2.say();
    27 
    28     </script>
    29 </head>
    30 <body>
    31 
    32 </body>
    33 </html>
    obj08
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function Person(name, age, works) {
     8             this.name = name;
     9             this.age = age;
    10             this.works = works;
    11             if (!Person.prototype.say) {
    12                 Person.prototype.say = function () {
    13                     window.alert(this.name + ",[" + this.works + "]");
    14                 }
    15             }
    16         }
    17 
    18         var person1 = new Person("wyp", 33, ['hg', 'zyx']);
    19         person1.works.push('db');
    20         //person1.say = function () {
    21         //    window.alert(this.age);
    22         //};
    23         var person2 = new Person("gh", 29, ['hg', 'zyx']);
    24 
    25         person1.say();
    26         person2.say();
    27 
    28         window.alert(person1.say == person2.say);
    29     </script>
    30 </head>
    31 <body>
    32 
    33 </body>
    34 </html>
    obj09
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         //function Person(name, age) {
     8         //    this.name = name;
     9         //    this.age = age;
    10         //    this.say = say;
    11         //}
    12 
    13         function Person() {
    14 
    15         }
    16 
    17         Person.prototype.name = "name";
    18         Person.prototype.age = 33;
    19         Person.prototype.say = function () {
    20             window.alert(this.name);
    21         }
    22 
    23         function say() {
    24             window.alert(this.name);
    25         }
    26 
    27         var person1 = new Person("wyp", 33);
    28         person1.name = "wyp";
    29         person1.say = function () {
    30             window.alert(this.age);
    31         }
    32         var person2 = new Person("gh", 29);
    33         window.alert("person1.say == person2.say:" + (person1.say == person2.say));
    34 
    35 
    36         window.alert("prototype.isPrototypeOf:" + Person.prototype.isPrototypeOf(person1));
    37 
    38         window.alert("constructor:" + (person1.constructor == Person));
    39 
    40         window.alert("name:" + person1.hasOwnProperty("name"));
    41 
    42         //delete person1.name;
    43         //window.alert("name:" + person1.hasOwnProperty("name"));
    44 
    45         window.alert(" [in] " + ("name" in person1));
    46 
    47 
    48         function isPrototypeProperty(obj,prop) {
    49             return (!(obj.hasOwnProperty(prop)) && (prop in obj));
    50         }
    51     </script>
    52 </head>
    53 <body>
    54 
    55 </body>
    56 </html>
    obj10
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         ( function (num) {
     8             for (var i = 0; i < num; i++) {
     9 
    10             }
    11         } )(20);
    12         window.alert(i);
    13     </script>
    14 </head>
    15 <body>
    16 
    17 </body>
    18 </html>
    close01
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function Parent() {
     8             this.pv = "parent";
     9         }
    10 
    11         Parent.prototype.showParent = function () {
    12             window.alert(this.pv);
    13         }
    14 
    15         function Child() {
    16             this.cv = "child";
    17         }
    18 
    19         Child.prototype = new Parent();
    20 
    21         Child.prototype.showChild = function () {
    22             window.alert(this.cv);
    23         }
    24 
    25         var child= new Child();
    26         //window.alert(child.pv);
    27         child.showParent();
    28         child.showChild();
    29 
    30 
    31     </script>
    32 </head>
    33 <body>
    34 
    35 </body>
    36 </html>
    jicheng01
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function Parent(name) {
     8             this.color = ['red', 'blue'];
     9             this.name = name;
    10             this.say = say;
    11         }
    12         function say() {
    13             window.alert(this.name);
    14         }
    15 
    16         function Child(name, age) {
    17             this.age = age;
    18             Parent.call(this, name);
    19         }
    20 
    21         var child1 = new Child("wyp", 33);
    22         //child1.color.push("yellow");
    23         //window.alert(child1.color);
    24         //window.alert(child1.name);
    25         //window.alert(child1.age);
    26         var child2 = new Child("meinv", 23);
    27         //window.alert(child1.name + "," + child1.age);
    28         //window.alert(child2.name + "," + child2.age);
    29         child1.say = function () {
    30             window.alert(child1.age);
    31         }
    32         child1.say();
    33         child2.say();
    34     </script>
    35 </head>
    36 <body>
    37 
    38 </body>
    39 </html>
    jicheng02
     1 <!DOCTYPE html>
     2 <html xmlns="http://www.w3.org/1999/xhtml">
     3 <head>
     4     <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
     5     <title></title>
     6     <script language="javascript" type="text/javascript">
     7         function Parent(name) {
     8             this.name = name;
     9             if(!Parent.prototype.say){
    10                 Parent.prototype.say = function () {
    11                     window.alert(this.name);
    12                 };
    13             }
    14         }
    15         //Parent.prototype = {};
    16 
    17        
    18 
    19         function Child(name, age) {
    20             this.age = age;
    21             Parent.call(this, name);
    22         }
    23 
    24         Child.prototype = new Parent();
    25 
    26         //重写父类say方法
    27         //Child.prototype.say = function () {
    28         //    window.alert(this.name + "," + this.age);
    29         //};
    30 
    31         var child1 = new Child("wyp", 33);
    32         child1.say();
    33 
    34 
    35 
    36     </script>
    37 </head>
    38 <body>
    39 
    40 </body>
    41 </html>
    jicheng03
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  • 原文地址:https://www.cnblogs.com/qiyebao/p/4168645.html
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