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@leohxj
Created May 29, 2014 06:00
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将阿拉伯数字每三位分隔,如15000->15,000
// 直白一点的方法, 循环拼接字符串
function formatNumber(number, split) {
var string = String(number);
var split = split || 3;
var newStr= new Array(string.length+ parseInt(string.length/split));
newStr[newStr.length-1]=string[string.length-1];
var currentIndex=string.length-1;
for(var i = newStr.length-1;i >= 0;i--)
{
if((newStr.length-i)%(split+1)==0)
{
newStr[i]=",";
}
else
{
newStr[i]=string[currentIndex--];
}
}
return newStr.join("")
}
// 直白2
function formatNumber(number, split) {
var string = String(number);
var split = split || 3;
var rmb='';
var i2=0;
for(var i=string.length-1; i>=0; i--){
if(i%split==0&&i!=0){
rmb+=string[i2]+',';
}else{
rmb+=string[i2];
}
i2++;
}
return rmb;
}
// 首先想到的是正则表达式,用到的正则为(/(\d{3})/g 或者 /(\d{3})(?=[^$])/g
function formatNumber(number, split) {
var string = String(number);
var split = split || 3;
// 注意这里,动态拼接正则的时候,注意转义字符
var SplitReg = eval("/(\\d{"+split+"})/g");
// var SplitReg = new RegExp("(\\d{"+split+"})", "g");
// 正则对字符串是从左向右划分,需要注意反转
return string.split("").reverse().join("").replace(SplitReg, "$1,").split("").reverse().join("");
}
// 上面不严谨,还有直接使用的正则
'1500000000000'.replace(/\B(?=(\d{3})+$)/g,',');
'1500000000000'.replace(/(?=(?!^)(?:\d{3})+(?:\.|$))(\d{3}(\.\d+$)?)/g,',$1');
// 利用toLocaleString()方法
15000000..toLocaleString();
// 递归
function formatNumber(number, split) {
number = String(number);
var split = split || 3;
if (number.length <= split) {
return number;
} else {
return formatNumber(number.substr(0, number.length - split) , split) + ',' + number.substr(number.length - split);
}
}
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