Example analysis on the simple operation code of prev() in jQuery

prev() function is used to match the previous sibling element of the element set. Only the previous sibling element is selected, and its child elements will be ignored. This article mainly introduces the simple operation code of prev() in jQuery. It is very good and has reference value. Friends who need it can refer to it. I hope it can help everyone.

A friend gave me a request: click the button to delete the input. If there is only one input left, click the button to delete all inputs.

It’s a very simple operation, but if you don’t know that there is a prev() method in jquery, you may take a lot of detours.

Code:

html

<p>
  <input type="text" placeholder="用户名">
  <input type="text" placeholder="用户名">
  <input type="text" type="hidden">
  <input type="text" type="hidden">
  <a class="reduce" onclick="less()">—</a>
 </p>

css

.reduce{
   display: inline-block;
   color: white;
   text-align: center;
   width: 30px;
   height: 30px;
   background: red;
   line-height: 30px;
   cursor: pointer;
  }
  input{
   height: 18px;
   padding: 5px 10px;
  }

JS

<script src="jquery-1.7.2.min.js"></script>
<script>
 var Reduce = document.getElementsByClassName("reduce");
 var Inp = document.getElementsByTagName("input");
 function less(){
    //查找元素的上一个元素 并移除
  $(".reduce").prev().remove();
  if(Inp.length < 1){
   $(".reduce").remove()
  }
 }
 $(".reduce")
</script>

I wrote a mixture here, not standardized, just a chestnut, the emphasis is on understanding.

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