js j将数字每三位用逗号隔开的方法

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>数字每隔三位逗号隔开</title>
</head>
<style type="text/css">
	.text{
		width: 300px;
		height: 40px;border: 1px solid #ccc;
		color: #000;font-size: 16px;line-height: 40px;font-weight:bold;
	}
</style>
<body>
	<div class="one">
		<h3>方法1</h3>
		<input class="one_input" value="100043241231.6">
		<input class="one_btn" type="button" value="提交" onclick="numbers.one()">
		<div class="one_text text">...</div>
	</div>
	<div class="two">
		<h3>方法2</h3>
		<input class="two_input" value="178943241231.5">
		<input class="two_btn" type="button" value="提交" onclick="numbers.two()">
		<div class="two_text text">...</div>
	</div>
	<div class="three">
		<h3>方法3</h3>
		<input class="three_input" value="12223241231.126">
		<input class="three_btn" type="button" value="提交" onclick="numbers.three()">
		<div class="three_text text">...</div>
	</div>
</body>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.js"></script>
<script type="text/javascript">
	var numbers = {
		one : function(){
			var oneval = $(".one_input").val();
			$(".one_text").html(parseFloat(oneval).toLocaleString());
		},
		two : function(){
			var twoval = $(".two_input").val();
			$(".two_text").html(fun.format_number1(twoval));
		},
		three : function(){
			var threeval = $(".three_input").val();
			$(".three_text").html(fun.format_number1(threeval));

		}
	}
	var fun = {
		format_number1 : function(n){
			var b=parseInt(n).toString();
		   	var len=b.length;
		   	if(len<=3){return b;}
		   	var r=len%3;
		   	return r>0?b.slice(0,r)+","+b.slice(r,len).match(/\d{3}/g).join(","):b.slice(r,len).match(/\d{3}/g).join(",");
		},
		format_number2 : function(str){
			var newStr = "";
			var count = 0;
			if(str.indexOf(".") == -1){
   				for(var i=str.length-1;i>=0;i--){
		 			if(count % 3 == 0 && count != 0){
		   				newStr = str.charAt(i) + "," + newStr;
		 			}else{
		   				newStr = str.charAt(i) + newStr;
		 			}
		 			count++;
   				}
   				str = newStr + ".00"; //自动补小数点后两位
   				console.log(str)
			}else{
		   		for(var i = str.indexOf(".")-1; i>=0; i--){
		 			if(count % 3 == 0 && count != 0){
		   				newStr = str.charAt(i) + "," + newStr;
		 			}else{
		   				newStr = str.charAt(i) + newStr; //逐个字符相接起来
		 			}
		 			count++;
		   		}
		   		str = newStr + (str + "00").substr((str + "00").indexOf("."),3);
		   		console.log(str)
		 	}
		}
	}
</script>
</html>