js中的string.format函数代码

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String.prototype.format = function(args)
{
if (arguments.length > 0)
{
var result = this;
if (arguments.length == 1 && typeof (args) == "object")
{
for (var key in args)
{
var reg = new RegExp("({" + key + "})", "g");
result = result.replace(reg, args[key]);
}
}
else
{
for (var i = 0; i < arguments.length; i++)
{
if (arguments[i] == undefined)
{
return "";
}
else
{
var reg = new RegExp("({[" + i + "]})", "g");
result = result.replace(reg, arguments[i]);
}
}
}
return result;
}
else
{
return this;
}
}

String.prototype.format = function(args)
{

if (!String.prototype.format) {

String.prototype.format = function() {

var str = this.toString();

if (!arguments.length)

return str;

var args = typeof arguments[0],

args = (("string" == args || "number" == args) ? arguments : arguments[0]);

for (arg in args)

str = str.replace(RegExp("\\{" + arg + "\\}", "gi"), args[arg]);

return str;

}

}

//两种调用方式
var template1="我是{0}，今年{1}了";
var template2="我是{name}，今年{age}了";
var result1=template1.format("loogn",22);
var result2=template1.format({name:"loogn",age:22});
//两个结果都是"我是loogn，今年22了"