<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
table{
border-collapse: collapse;
}
td,th{
border: 1px solid #aaa;
height: 45px;
}
</style>
</head>
<body>
<table>
<thead>
<tr>
<th>库存</th>
<th>取量</th>
</tr>
</thead>
<tbody>
<tr>
<td>12333</td>
<td>
<input type="text" name="" id="" value="" />
</td>
</tr>
<tr>
<td>12333</td>
<td>
<input type="text" name="" id="" value="" />
</td>
</tr>
</tbody>
</table>
<br />
<button class="" type="button">提交</button>
<script src="js/jquery-2.1.4.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
var arr=[];
$("button").click(function(){
$("input").each(function(){
arr=[];
var $this=$(this);
var val=$this.val();
var kucun=$this.closest(‘td‘).prev().html();
var result=parseFloat(kucun-val);
if(val==""){
arr.push("isNull");
}else{
if(result>0){
arr.push(‘yes‘);
}else if(result<0){
arr.push("no");
}
}
});
var index=arr.indexOf(‘isNull‘);//是否有空值
var yIndex=arr.indexOf(‘yes‘);//库存足够
var nIndex=arr.indexOf(‘no‘);//库存不足
//console.log(index);
if(index!=-1){
alert("有空值");
}else{
if(nIndex!=-1){
alert(‘库存不足‘);
}else{
alert("go on");
}
}
})
</script>
</body>
</html>
原文：https://www.cnblogs.com/lyt598/p/10666568.html