Example sharing of simple rollback operation of each loop in jquery

This article mainly introduces the relevant knowledge of the simple rollback operation of each loop in jquery, which has a good reference value. Let's take a look with the editor below, I hope it can help everyone.

Without further ado, please take a look at the code:

var ispass = true;
var obj = new Object();
$.each(data,function(i,td){
　　var sum=data[i].sum;
　　var num=data[i].num;
　　var id=data[i].num;
　　if(num>sum){
       ispass=false;
       alert("数量不能大于总数量！");
　　　　 sum+=num;
      return false;
     }
     obj[id]=sum;
})
if(!ispass){
　　return false;//如果执行到这里则上面的each循环的内容都不存在
}else{
　　$.each(obj,function(id,sum){
　　alert(id);
　　alert(num);
　　})
}

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