js面向过程-经典选项卡

源代码

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <meta http-equiv="X-UA-Compatible" content="ie=edge">

    <title>选项卡</title>

    <style>

        #div1 input {background:#CCC;}

        #div1 div {width:200px; height:200px; background:#CCC; display:none;}

        #div1 .active {background:yellow;}

        #div1 .kin {background:red;}

    </style>

    <script>

        window.onload = function() {

            var oDiv = document.getElementById('div1');

            var aBtn = oDiv.getElementsByTagName('input');

            var aDiv = oDiv.getElementsByTagName('div');

            var i = 0;

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

                // index 属性可返回标签的索引位置

                aBtn[i].index = i;

                //测试i的索引位置

                // alert(i);

                // 给onclick事件添加自定义方法

                aBtn[i].onclick = function() {

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

                        // 给未点击的按钮添加class="kin"

                        aBtn[i].className = 'kin';

                        // 给当前Div的class添加style="display:none"

                        aDiv[i].style.display = 'none';

                    }

                    // 鼠标点击那个按钮就给那个添加class="active"

                    this.className = 'active';

                    // 给当前的class添加style="display:block"

                    aDiv[this.index].style.display = 'block';

                };

            }

        };

    </script>

</head>

<body>

<div id="div1">

    <input type="button" value="txt1" class="active" />

    <input type="button" value="txt2" />

    <input type="button" value="txt3" />

    <div style="display:block;">txt1content</div>

    <div>txt2content</div>

    <div>txt3content</div>

</div>

</body>

</html>

运行结果

js面向过程-经典选项卡-LMLPHP

核心代码

1. index属性

作用：返回标签的索引位置

 aBtn[i].index = i;

2.给onclick事件添加自定义方法

aBtn[i].onclick = function() {

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

aBtn[i].className = 'kin';

aDiv[i].style.display = 'none';

}

this.className = 'active';

aDiv[this.index].style.display = 'block';

};