JavaScript通过call实现类继承的示例解析

利用call实现类继承的代码示例

<script type="text/javascript">
//父类ClassA
function ClassA(sColor) {
  this.color = sColor;
  this.sayColor = function () {
    document.write("Color:" + this.color + "<br/>");
  };
}
//子类ClassB,继承自ClassA
function ClassB(sColor,sName){  
  ClassA.call(this,sColor);//利用call函数，将ClassA的所有方法都赋给ClassB，即实现了继承
  this.name = sName;
  this.sayName = function(){
    document.write("Name:" + this.name + "<br/>");
  }
}
var oClassA = new ClassA("Red");
oClassA.sayColor();
var oClassB = new ClassB("Blue","Jimmy.Yang");
oClassB.sayColor();//这里sayColor方法是从ClassA继承来的
oClassB.sayName();//这是ClassB中的新方法
/*
call函数的演示示例
function sayColor(sPrefix, sSuffix) {
alert(sPrefix + this.color + sSuffix);
};
var obj = new Object();
sayColor.call(obj, "The color is ", ", a very nice color indeed. ");
*/
</script>