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/**
* Created by dcp on 2018/9/28.
*/
// 写代码实现一个 cut 函数cut(3123123123.123); //3,123,123,123.123
var num=3123123123.123
function cut(num) {
var arr=num.toString().split('.')
var t1=arr[0].toString().split('');
var t2=arr[1].toString();
var result=[],counter=0;
for(var i=t1.length-1;i>=0;i--){
counter++;
result.unshift(t1[i]);
if((counter%3)==0&&i!=0)
{
result.unshift(',');
}
}
var t3=result.join('')
var t4=t3+'.'+t2
return t4
}
console.log(cut(num))