javascript 之string.format

function(){
    ‘use strict‘;

    if(String.prototype.format)
        return;

    String.prototype.format = function(args){

        var _dict = typeof(args) == ‘object‘ ? args : arguments;

        return this.replace(/{([^{}]+)}/g,function(s,n){
            return _dict[n]===undefined?s:_dict[n];
        });

    };

})();

useage：

var str = ‘{name} is {age} years old.‘;
str.format({name:‘Tom‘,age:25});//”Tom is 25 years old.”

str = ‘{0} is {1} years old.‘;
str.format(‘Jerry‘,15);//”Jerry is 15 years old.”
str.format([‘Bill‘,10]);//"Bill is 10 years old."

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