JavaScript技巧——变量Dom对象的所有属性

DOM对象的HTML:

  <button id="btnToggleState" onclick="toggleStateManagement()">Disable State</buttom>

1,遍历DOM对象所具有的属性(全部,不管是否在HTML tag中是否设置)

<!DOCTYPE html>
<html>

<body>
    <button id="btnToggleState" onclick="toggleStateManagement()">
            Disable State
    </button>
</body>
<script>
    var obj = document.getElementById("btnToggleState");
    var s = "";
    for (var elem in obj) {
        s += elem + "\n";
    }
    alert(s);
</script>

</html>

 结果:

 

2.遍历DOM对象在HTML中设置过的属性:

  每一个attribute属性有一个附加属性specified,当属性是HTML Element的属性(指写在代码中可见的),或者是通过setAttribute方法进行的添加的时候,它的值为 true。

<!DOCTYPE html>
<html>

<body>
    <button id="btnToggleState" onclick="toggleStateManagement()">
            Disable State
        </button>
</body>
<script>
    // var obj = document.getElementById("btnToggleState");
    // var s = "";
    // for (var elem in obj) {
    //     s += elem + "\n";
    // }
    // alert(s);


    var obj = document.getElementById("btnToggleState");
    var pairs = new Array();
    for (var i = 0, len = obj.attributes.length; i < len; i++) {
        var name = obj.attributes[i].nodeName;
        var value = obj.attributes[i].nodeValue;
        if (obj.attributes[i].specified) {
            pairs.push(name + "=\' " + value + "\' ")
        }
    }
    alert(pairs);
</script>

</html>

 

结果如下:

 

posted @ 2020-04-29 12:14  颗就完了  阅读(479)  评论(0编辑  收藏  举报