/**
* 格式化数字显示方式
* 用法
* formatNumber(12345.999,'#,##0.00')
* formatNumber(12345.999,'#,##0.##')
* formatNumber(123,'000000')
* @param num
* @param pattern
*/
function formatNumber(num,pattern){
var strarr = num?num.toString().split('.'):['0']
var fmtarr = pattern?pattern.split('.'):['']
var retstr=''
// 整数部分
var str = strarr[0]
var fmt = fmtarr[0]
var i = str.length-1
var comma = false
for(var f=fmt.length-1f>=0f--){
switch(fmt.substr(f,1)){
case '#':
if(i>=0 ) retstr = str.substr(i--,1) + retstr
break
case '0':
if(i>=0) retstr = str.substr(i--,1) + retstr
else retstr = '0' + retstr
break
case ',':
comma = true
retstr=','+retstr
break
}
}
if(i>=0){
if(comma){
var l = str.length
for(i>=0i--){
retstr = str.substr(i,1) + retstr
if(i>0 &&((l-i)%3)==0) retstr = ',' + retstr
}
}
else retstr = str.substr(0,i+1) + retstr
}
retstr = retstr+'.'
// 处理小数部分
str=strarr.length>1?strarr[1]:''
fmt=fmtarr.length>1?fmtarr[1]:''
i=0
for(var f=0f<fmt.lengthf++){
switch(fmt.substr(f,1)){
case '#':
if(i<str.length) retstr+=str.substr(i++,1)
break
case '0':
if(i<str.length) retstr+= str.substr(i++,1)
else retstr+='0'
break
}
}
return retstr.replace(/^,+/,'').replace(/\.$/,'')
}
alert(formatNumber(12345.999,'#,##0.00'))
</script>
方法1：(123456789.2333).toLocaleString('en-US')
方法2：
function format(input) {
var n = parseFloat(input).toFixed(2)
var re = /(\d{1,3})(?=(\d{3})+(?:\.))/g
return n.replace(re, "$1,")
}
format(123456789.2333)
