首页

有时候我们需要判断，某个标签下面是否包含有某一class的子标签并获得子标签。例子如下：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <script src="https://www.suibibk.com/js/jquery.min.js"></script>
        <title>首页</title>
    </head>
        <div class="item">
            <div>1</div>
            <div>
                <div class="result">2</div>
                <div class="result on">3</div>
            </div>
        </div>
        <div class="item">
            <div>1</div>
            <div>
                <div class="result">2</div>
                <div class="result on">3</div>
            </div>
        </div>
        <div class="item">
            <div>1</div>
            <div>
                <div class="result">2</div>
                <div class="result">3</div>
            </div>
        </div>
    <body>
        <script>
            $(".item").each(function(){
                //获取id,和status，只有有status为01的时候才可能审核
                var obj = $(this);
                //查看有没有on
                var result = obj.find(".on");
                var length = result.length;
                if(length==1){
                    var o = result.first();
                    console.log(o.html())
                }
                console.log("length:"+length);
            });
           </script>    
    </body>
</html>

其实关键的就是判断长度。