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:
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