几种常用的JS类定义方法

var obj1 = {
    v1 : "",
    get_v1 : function() {
        return this.v1;
    },
    set_v1 : function(v) {
        this.v1 = v;
    }
};

var Obj = function() {
    var v1 = "";
    this.get_v1 = function() {
        return this.v1;
    };
    this.set_v1 = function(v) {
        this.v1 = v;
    }
};

var Obj3 = new Function();
Obj3.prototype = {
    v1 : "",
    get_v1 : function() {
        return this.v1;
    },
    set_v1 : function(v) {
        this.v1 = v;
    }
};

function loadObj() {
    var tmp = new Object();
    tmp.v1 = "";
    tmp.get_v1 = function() {
        return tmp.v1;
    };
    tmp.set_v1 = function(v) {
        tmp.v1 = v;
    };
    return tmp;
}

obj1.set_v1('hello1');
alert(obj1.get_v1());

var obj2 = new Obj();
obj2.set_v1('hello2');
alert(obj2.get_v1());

var obj3 = new Obj();
obj3.set_v1('hello3');
alert(obj3.get_v1());

var obj4 = loadObj();
obj4.set_v1('hello4');
alert(obj4.get_v1());

alert(obj1);
alert(obj2);
alert(obj3);
alert(obj4);