JavaScript OOP(三) -- 关于Prototype
由于constructor.prototype指向的是一object实例，并且只实例化一次，所以可能出现数据共享问题。
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<html><head><title>object test</title><script language="javascript"><!--function Student(name, age) {this.name = name;this.age = age;this.sayHello = function() {alert("Hello, I am " + this.name);}this.toString = function() {return this.name + " : " + this.age;}}function CollegeStudent(major) { this.major = major; this.toString = function() { return this.student.name + " : " + this.student.age + " : " + this.major; } } var studentPrototype = new Student("siyuan", 24); CollegeStudent.prototype.student = studentPrototype; function testPrototype() { var colleger1 = new CollegeStudent("software"); alert(colleger1); var colleger2 = new CollegeStudent("hardware"); alert(colleger2); colleger1.student.name = "siyuan1"; alert("modify colleger1.student.name"); alert(colleger1); alert(colleger2); }--></script></head><body><input type="button" value="test prototype" onclick="javascript:testPrototype();"/><br></body></html>?