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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <title>test</title> <script type="text/javascript"> window.onload = function() { document.getElementById("test").onkeyup = function() { this.value = this.value.replace(/(\d{4})(?=\d)/g,"$1 "); }; }; </script> </head> <body> <input type="text" id="test" /> </body> </html>
function formatNum(number,n)
{
number = number+"";
if(number.indexOf(",")!=-1)
number=number.replace(/\,/g,"");
if (number=="") return "";
if(n==0) return number;
if(!isNaN(number))
{
number=parseFloat(number).toFixed(n);//保留3位小数
if(number<0)
{
number=number.replace(/\-/g,"");//去掉负号
var digit =number.indexOf("."); // 取得小数点的位置
var right=number.substring(digit);
return '-'+outputDollars(Math.floor(number-0) + '')+right;
}
else
{
var digit =number.indexOf("."); // 取得小数点的位置
var right=number.substring(digit);
return outputDollars(Math.floor(number-0) + '')+right;
}
}
else
{
return number;
}
}