怎样使用JS继承与多继承

var inherit=function(objBase){
    var F=function(){}; //第一步：定义一个函数F
    F.prototype=objBase; //第二步：将传进来的基类对象(objBase)赋给函数F的原型(F.prototype)
    return new F(); //第三步：返回一个F对象(已经具备了objBase特征)
}

Function.prototype.inherit=function(objBase){
    this.prototype=new objBase();
}
var Person=function(){
    this.name="倩倩";
    this.sex="女";
}
var Student=function(){
    this.id="0712";
}
Student.inherit(Person);
var student=new Student();
alert(student.name +","+ student.sex +","+ student.id);

var o1={name:"倩倩"} //对象的字面值
var o2={sex:"女"}
var She=function(){}
She.prototype={};  //先声明
for(var k in o1){
    She.prototype[k]=o1[k];
}
for(var k in o2){
    She.prototype[k]=o2[k];
}
var she=new She();
alert(she.name + "," + she.sex);

Function.prototype.inherits=function(){
    var arr=arguments; //将接收到的arguments对象传给数组arr
    this.prototype={};
    for(var i=0;i<arr.length;i++){
      for(var k in arr[i]){
        var obj=arr[i];
        this.prototype[k]=obj[k];
      }
    }
}
var o1={name:"倩倩"} //对象的字面值
var o2={sex:"女"}
var She=function(){}
She.inherits(o1,o2);
var she=new She();
alert(she.name + "," + she.sex);