String.prototype.format = function(args) {
var result = this;
if (arguments.length > 0) {
if (arguments.length == 1 && typeof (args) == "object") {
for (var key in args) {
if(args[key]!==undefined){
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) {
//var reg = new RegExp("({[" + i + "]})", "g");//这个在索引大于9时会有问题
var reg2= new RegExp("({)" + i + "(})", "g");
result = result.replace(reg2, arguments[i]);
}
}
}
}
return result;
};
//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=template2.format({name:"loogn",age:22});
//两个结果都是"我是loogn,今年22了"
from:http://www.cnblogs.com/loogn/archive/2011/06/20/2085165.html