构造函数继承

function SuperType(){

this.colors = [1,2,3];

}

function SubType(){

//继承属性

SuperType.call(this);

}

var in1 = new SubType();

in1.colors.push(4);

alert(in1.colors);

var in2 = new SubType();

in2.colors.push(5);

alert(in2.colors);

function SuperType(name){

this.name = name;

}

function SubType(name){

//继承属性

SuperType.call(this,name);

}

var in1 = new SubType("Jack");

alert(in1.name);  //jack

var in2 = new SubType("gogo");

alert(in2.name); //gogo