jQuery 获取元素数量 / 检查元素是否存在

2487

jQuery 元素的数量 length

jQuery(selecter).length

这个方法会返回一共有多少个改元素。

在实际应用中,我们可以用它来判断目标HTML对象是否存在

if(jQuery("#slider").length > 0){
  // do next step
}

 

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