请编写 formatNum函数，将数字转为千分位格式 ，每三位数加入逗号；var a=1234567;var b=formatNum(a);//b="1,234,567"
2 回答
千秋此意
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function formatNum(iNum) {
var count = 0, temp = iNum.toString().split('');
for (var i = temp.length - 1; i > 0; i--) {
(++count % 3 === 0) && temp.splice(i, 0, ',');
}
return temp.join('');
}
var result = formatNum(123233233233);
console.log(result); // 123,233,233,233
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stone310
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function num(a) {
var b = String(a).split("");
var c = "";
var num =Math.ceil(b.length/3-1);
for (var i = 1; i <= num; i++) {
b.splice(-i * 4 + 1, 0, ",")
}
for (var i = 0; i < b.length; i++) {
c += b[i]
}
console.log(c)
}
num(1234567)
xuchaoi
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>demo</title>
</head>
<body>
<h1>思路：输入一个数后，转成字符串再把这个字符串颠倒。接着每隔3个给一个逗号。最后把得到的字符串再颠倒过来。</h1>
<script>
function formatNum(num) {
var strnum = num.toString();
var downNumber = strnum.split("").reverse().join("");
var number = "";
for(var i=0;i<strnum.length;i++){
if(i === (strnum.length-1)) {
number += (i+1)%3 === 0 ? downNumber.substr(i-i%3,3) : downNumber.substr(i-i%3,(i+1)%3);
}else{
if((i+1)%3 === 0) {
number += downNumber.substr(i-2,3) + ",";
}
}
}
number = number.split("").reverse().join("");
return number;
}
var num = 12394723942; //随便输入一个数
var result = formatNum(num);
console.log("原值：" + num);
console.log("格式后的值：" + result);
</script>
</body>
</html>
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