JavaScript ¼Ì³ÐÏê½â3

ÔÚµÚÒ»ÕÂÖУ¬ÎÒÃÇʹÓù¹Ô캯ÊýºÍÔ­Ð͵ķ½Ê½ÔÚJavaScriptµÄÊÀ½çÖÐʵÏÖÁËÀàºÍ¼Ì³Ð£¬ µ«ÊÇ´æÔںܶàÎÊÌâ¡£ÕâÒ»ÕÂÎÒÃǽ«»áÖðÒ»·ÖÎöÕâЩÎÊÌ⣬²¢¸ø³ö½â¾ö·½°¸¡£
×¢£º±¾ÕÂÖеÄjClassµÄʵÏֲο¼ÁËSimple JavaScript Inheritance
µÄ×ö·¨¡£
Ê×ÏÈÈÃÎÒÃÇÀ´»Ø¹ËһϵÚÒ»ÕÂÖнéÉܵÄÀý×Ó£º
function Person(name) {
this.name = name;
}
Person.prototype = {
getName: function() {
return this.name;
}
}
function Employee(name, employeeID) {
this.name = name;
this.employeeID = employeeID;
}
Employee.prototype = new Person();
Employee.prototype.getEmployeeID = function() {
return this.employeeID;
};
var zhang = new Employee("ZhangSan", "1234");
console.log(zhang.getName()); // "ZhangSan"
ÐÞÕýconstructorµÄÖ¸Ïò´íÎó
´ÓÉÏһƪÎÄÕÂÖйØÓÚconstructorµÄÃèÊö£¬ÎÒÃÇÖªµÀEmployeeʵÀýµÄconstructor»áÓÐÒ»¸öÖ¸Ïò´íÎó£¬ÈçÏÂËùʾ£º
var zhang = new Employee("ZhangSan", "1234");
console.log(zhang.constructor === Employee); // false
console.log(zhang.constructor === Object); // true
ÎÒÃÇÐèÒª¼òµ¥µÄÐÞÕý£º
function Employee(name, employeeID) {
this.name = name;
this.employeeID = employeeID;
}
Employee.prototype = new Person();
Employee.prototype.constructor = Employee;
Employee.prototype.getEmployeeID = function() {
return this.employeeID;
};
var zhang = new Employee("ZhangSan", "1234");
console.log(zhang.constructor === Employee); // true
console.log(zhang.constructor === Object); // false
´´½¨EmployeeÀàʱʵÀý»¯PersonÊDz»ºÏÊʵÄ
µ«ÁíÒ»·½Ã棬ÎÒÃÇÓÖ±ØÐëÒÀÀµÓÚÕâÖÖ»úÖÆÀ´ÊµÏּ̳С£ ½â¾ö°ì·¨ÊDz»ÔÚ¹¹Ô캯ÊýÖгõʼ»¯Êý¾Ý£¬¶øÊÇÌṩһ¸öÔ­ÐÍ·½·¨£¨±ÈÈçinit£©À´³õʼ»¯Êý¾Ý¡£
// ¿ÕµÄ¹¹Ô캯Êý
function Person() {
}
Person.prototype = {
init: function(name) {
this.name = name;
},
getName: function() {
return this.name;
}
}
// ¿ÕµÄ¹¹Ô캯Êý
function Employee() {
}
// ´´½¨ÀàµÄ½×¶Î²»»á³õʼ»¯¸¸ÀàµÄÊý¾Ý£¬ÒòΪPersonÊÇÒ»¸ö¿ÕµÄ¹¹Ô캯Êý
Employee.prototype = new Person();
Employee.prototype.constructor = Employee;
Employee.prototyp