call和apply的用法，并利用call实现js类的继承
/*
* 矩形
*/
function Rectangle(len,width) {
this.len = len;
this.width = width;
}
/*
* 乘以
*/
function multiply(a,b) {
return a * b;
}
// 矩形实例
var rectangle = new Rectangle(15, 30);
//求矩形面积
var proportion = multiply.call(rectangle,rectangle.len, rectangle.width);
// 等价于call
//var proportion = multiply.apply(rectangle,[rectangle.len, rectangle.width]);
document.write("矩形的面积是："+proportion);
document.write("<br/>");
document.write("/***********************分割线********************************/<br/>");
// 实现继承
function Persion(name) {
this.name = name;
this.sayHello = function () {
return "hello，"+this.name;
}
}
function Student(name,sex,school) {
Persion.call(this,name);
this.sex = sex;
this.school = school;
this.mySex = function () {
return this.sex;
}
this.mySchool = function () {
return this.school;
}
}
var stu = new Student('fengjx','男','广西机电职业技术学院')
document.write("stu sayHello："+stu.sayHello());
document.write("<br/>");
document.write("stu sex is："+stu.mySex());
document.write("<br/>");
document.write("stu school is ："+stu.mySchool());
document.write("<br/>");演示图：
以上所述就是本文的全部内容了，希望大家能够喜欢。
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