扫码消费数量栏点击可编辑，失去焦点还原样式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>changevalue</title>
</head>
<body>
<ul>
<li οnclick="changeValue(this)">1</li>
<li οnclick="changeValue(this)">2</li>
<li οnclick="changeValue(this)">3</li>
</ul>
</body>
<script type="text/javascript" href="js/jquery-1.8.0.min.js"></script>
<script type="text/javascript">
var isEdit=0;
function changeValue(li){
if (isEdit++!=0) {
return false;
}
var oldValue=li.innerHTML;
li.innerHTML="<input οnblur='confirmChange(this)' value='"+oldValue+"'/>";
}
function confirmChange(input){
var newValue=input.value;
var li=input.parentNode;
li.innerHTML=newValue;
isEdit=0;
}
</script>
</html>
