discuz javascript 根据classname获得对象

我们先查看函数代码：

    function $C(classname, ele, tag) {
    var returns = [];
    ele = ele || document;
    tag = tag || ‘*’;
    if(ele.getElementsByClassName) {
        var eles = ele.getElementsByClassName(classname);
        if(tag != ‘*’) {
            for (var i = 0, L = eles.length; i < L; i++) {
                if (eles[i].tagName.toLowerCase() == tag.toLowerCase()) {
                        returns.push(eles[i]);
                }
            }
        } else {
            returns = eles;
        }
    }else {
        eles = ele.getElementsByTagName(tag);
        var pattern = new RegExp("(^|\\s)"+classname+"(\\s|$)");
        for (i = 0, L = eles.length; i < L; i++) {
                if (pattern.test(eles[i].className)) {
                        returns.push(eles[i]);
                }
        }
    }
    return returns;
}

再查看实例：

<div class="col">222222222222222222222222222</div>
<span class="col">1111111111111111</span>

<script type="text/javascript">
alert($C(‘col’,document,’span’)[0].innerHTML);
</script>

要注意的是该函数返回的是对象数组，所以如果要操作就要索引！如上面的$C(‘col’,document,’span’)[0]。

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