javascript，对JavaScript中的5种主要的数据类型（包括Number、String、Object、Array、Boolean）进行值复制

 var clone = function(obj){       var buf;        if(obj instanceof Array){            buf = [];            var i = obj.length;            while(i--){                buf[i] = obj[i];            }            return buf;        }else if(obj instanceof Object){            buf = {};            for(var k in obj){                buf[k] = clone(obj);            }            return buf;        }else{            return obj;        }    };

另一种：

 Object.prototype.clone = function(){        var o = this.constructor === Array ?[]:{};        for(var e in this){            o[e] = typeof this[e] === 'object'?this[e].clone:this[e];        }        return o;    };