dom绑定事件操作

dom绑定事件操作

s7.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    #test{
        background-color: red;
        width:300px;
        height:400px;
    }
</style>
<body>
<div id="test">
    sdsd
</div>
<script>
    var mydiv=document.getElementById('test');
    mydiv.onclick=function () {
        console.log('wwwwwwwwwwwwww')
    }
</script>
</body>
</html>
行为样式相分离

S8.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <input type="button" onclick="AddEle1();" value="+">
    <input type="button" onclick="AddEle2();" value="+">
    <div id="i1">
        <p><input type="text"></p>
        
    </div>
    <script>
        function AddEle1() {
            //创建一个标签
            //将标签添加到i1里面
            var tag="<p><input type='text'/></p>";
            //注意：第一个参数只能是'beforeBegin'、 'afterBegin'、 'beforeEnd'、 'afterEnd'
            document.getElementById('i1').insertAdjacentHTML("afterEnd",tag);
        }
        function AddEle2() {
            //创建一个标签
            //将标签添加到i1里面
            var tag=document.createElement('input'); //创建一个input标签
            tag.setAttribute('type','text')
            tag.style.fontSize="16px";
            tag.style.color='red';

            var p=document.createElement('p'); //创建p标签
            p.appendChild(tag)
            document.getElementById('i1').appendChild(p) //添加p标签
        }
    </script>
</body>
</html>
</body>
</html>

S9.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form id='f1' action="http://www.baidu.com">
        <input type="text">
        <input type="submit" value="提交">
        <a onclick="submitForm();">提交1</a>

    </form>
    <script>
        function submitForm() {
            document.getElementById('f1').submit();
            alert(123);
            var v=confirm('确定?');
            console.log(v)
        }
        var obj=setInterval(function(){
            console.log(1);
        },1000)
        clearInterval(obj);

    </script>
</body>
</html>

提交表单
任何标签通过DOM都可以提交表单
document.getElementById('f1').submit();
alert(); 弹窗
confirm('确定?') 确认框确认为true 取消为false
console.log(v) console口打印

location.href 获取当前url
location.href="http://www.baidu.com" 设置当前url 用于做重定向跳转
location.href=location.href 刷新
location.reload(); 刷新

var obj=setInterval(function(){},5000) 定时器 5000毫秒执行一次函数
clearInterval(obj);清除定时器

setTimeout 定时器只执行一次
obj= setTimeout(function (){},5000)
清除定时器
claerTimeout(obj);

S10.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="status"></div>
    <input type="button" value="删除" onclick="deleteEle(); "/>
    <script>
        function deleteEle() {
            document.getElementById('status').innerText="已经删除";
            obj= setTimeout(function () {
                document.getElementById('status').innerText='';
            },5000)
            clearTimeout(obj)
        }
    </script>
</body>
</html>
document.getElementById('status').innerText="已经删除"; 重新添加标签内容

S11.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<table border="1" width="300px">
    <tr onmouseover="t1(0);" onmouseout="t2(0);"><td>1</td><td>2</td><td>2</td></tr>
    <tr onmouseover="t1(1);" onmouseout="t2(1);"><td>1</td><td>2</td><td>2</td></tr>
    <tr onmouseover="t1(2);" onmouseout="t2(2);"><td>1</td><td>2</td><td>2</td></tr>
</table>
<script>
    function t1(n) {
        var mytrs=document.getElementsByTagName('tr')[n];
        mytrs.style.backgroundColor='red';
    }
      function t2(n) {
        var mytrs=document.getElementsByTagName('tr')[n];
        mytrs.style.backgroundColor='';
    }
</script>
</body>
</html>
dom0的方式

绑定事件的两种方式:
a.直接标签绑定 onclick='' onfocus=''
b.先获取dom对象，然后进行绑定
    document.getElementById('xx').onclick
    document.getElementById('xx').onfocus

this 当前触发事件的标签
    a.第一种绑定方式
    <input id="i1" type="button" onclick="clickon(this)">
    function clickon(self){
    //self 代指当前点击的标签
    }

    b.第二种绑定方式
    <input id="i1" type="button" >
    document.getElementById('xxx').onclick=function(){
      //this 代指当前点击的标签
    }

    c.第三种绑定方式
    var mycontent=document.getElementById('i1');
        mymain.addEventListener('click',function(){console.log('aaaaa')},false);
        mymain.addEventListener('click',function(){console.log('bbbbb')},false);

作用域示例
    var mytrs=document.getElementsByTagName('tr');
    var len=mytrs.length;
    for(var i=0;i<len;i++){
        mytrs[i].onmouseover=function () {
           this.style.backgroundColor="red";
        }
        mytrs[i].onmouseout=function () {
           this.style.backgroundColor="";
        }

S12.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<table border="1" width="300px">
    <tr><td>1</td><td>2</td><td>2</td></tr>
    <tr><td>1</td><td>2</td><td>2</td></tr>
    <tr><td>1</td><td>2</td><td>2</td></tr>
</table>
<script>
    var mytrs=document.getElementsByTagName('tr');
    var len=mytrs.length;
    for(var i=0;i<len;i++){
        mytrs[i].onmouseover=function () {
           this.style.backgroundColor="red";
        }
        mytrs[i].onmouseout=function () {
           this.style.backgroundColor="";
        }
    }
</script>
</body>
</html>
dom1的方式
this 光标指向那个tr就指向那个tr

S12-1.html

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Title</title>

    <style>

        .hide{

            display: none;

        }

        .item .header{

            height: 35px;

            background-color: #2459a2;

            color: white;

            line-height: 35px;

        }

    </style>

</head>

<body>

    <div style="height: 48px;"></div>

    <div style="width: 300px;">

        <div class="item">

            <div class="header" onclick="ChangeMenu(this);">菜单1</div>

            <div class="content">

                <div>内容1</div>

                <div>内容1</div>

                <div>内容1</div>

            </div>

        </div>

        <div class="item">

            <div class="header" onclick="ChangeMenu(this);">菜单2</div>

            <div class="content hide">

                <div>内容2</div>

                <div>内容2</div>

                <div>内容2</div>

            </div>

        </div>

        <div class="item">

            <div class="header" onclick="ChangeMenu(this);" >菜单3</div>

            <div class="content hide">

                <div>内容3</div>

                <div>内容3</div>

                <div>内容3</div>

            </div>

        </div>

        <div class="item">

            <div class="header" onclick="ChangeMenu(this);" >菜单4</div>

            <div class="content hide">

                <div>内容4</div>

                <div>内容4</div>

                <div>内容4</div>

            </div>

        </div>

    </div>

    <script>

        function ChangeMenu(ths) {

            var current_header=ths;

            var item_list=current_header.parentElement.parentElement.children;

            for (var i=0;i<item_list.length;i++){

                var current_item=item_list[i];

                current_item.children[1].classList.add('hide');

            }

            current_header.nextElementSibling.classList.remove('hide');

        }

    </script>

</body>

</html></title>
</head>
<body>

</body>
</html>

S12-2.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
    #test{
        background-color: red;
        width:300px;
        height:400px;
    }
</style>
<body>
<div id="test">
    sdsd
</div>
<script>
    var mydiv=document.getElementById('test');
    mydiv.addEventListener('click', function(){console.log('aaaaa')},false);
    mydiv.addEventListener('click', function(){console.log('bbbbb')},false);
</script>
</body>
</html>
dom2绑定方法

S13.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
    <style>
        #main{
            background-color: red;
            width: 300px;
            height:400px;
        }
        #content{
            background-color: pink;
            width: 150px;
            height:200px;
        }
    </style>
<body>
    <div id="main">
        <div id="content"></div>
    </div>
    <script>
        var mymain=document.getElementById('main');
        var mycontent=document.getElementById('content');
        mymain.addEventListener('click',function(){console.log('main')},false);
        mycontent.addEventListener('click',function(){console.log('content')},false); //冒泡底下的先出来 true的模式刚好相反
    </script>
</body>
</html>

S14.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    function t1(age) { //age 先找到函数声明表达式 function age()
        console.log(age); //function age()
        var age=27;
        console.log(age); //27
        function age() {}; //没有调用，通过
        console.log(age); // 27 没有改变
    }
    t1(3);
</script>
</body>
</html>
active object ====>> AO 活动对象
1.形式参数
2.局部变量
3.函数声明表达式

1.形式参数
AO.age=undefined
AO.age=3
2.局部变量
AO.age=undefined
3.函数声明表达式优先级最高
AO.age=function()
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原文地址：https://www.cnblogs.com/leiwenbin627/p/10859666.html