字符串处理

1    String.prototype.spacify = function(){
2        return this.split("").join(" ");
3    };
4    console.log("abc".spacify()); //a b c

1    Array.prototype.duplicator = function(){
2        for(var i = 0,len = this.length; i < len; i++){
3            this.push(this[i]);
4        }
5        return this;
6    };
7    
8    console.log([1,2,3,4,5].duplicator()); //[1,2,3,4,5,1,2,3,4,5]

1    function log(){
2        var str = Array.prototype.slice.call(arguments);
3        str.unshift("(app)");
4        console.log.apply(console,str);
5    }
6    log("hello","world");  //(app) hello world