<!doctype >
<html>
<meta utf="utf-8">
<header>
<title>PRACTISE</title>
<script >
function MakeMe(name , age , likes, shout){ //creates objects
return {
name : name,
age : age,
likes : likes,
shout : function(){
alert(shout + " " +last(this.likes));
}
}
}
function last(obj){ //gets last element of the array
var el=obj.pop();
obj.push(el);
return el;
}
var dammy = MakeMe("Damilola" , 20, ["Jesus" , "Programming"], "Ewooooooo");//creates an object
dammy.shout();
var dara = MakeMe("Daramola" , 17, ["God" , "Gaming" , "Ed sheeran"] , "Leaveeeeeeeeeeee");//creates an object
// i wrote the following codes below to check if dammy and dara are really different objects
alert(last(dara.likes));
dara.shout();
dammy.likes.push("Taylor");
alert(last(dara.likes));
alert(last(dammy.likes));
dammy.shout();
</script>
</head>
</html>
我的主要问题是:与使用构造函数和使用“new”关键字的常规方法相反，这是一种在 javascript 中创建对象的好方法吗？如果使用上述方法创建对象有任何副作用。谢谢你
//Normal way is
function MakeMe(name ,age, likes, shout){
this.name = name;
this.age= age;
this.likes={"me", "you", "us"};
this.shout = function(){
alert(shout + " " +last(this.likes));
};
}
var dammy = new MakeMe("D" , 17, ["God" , "Gaming" , "Lorde"] , "Loveee");
最佳答案
有一个区别，这个区别在于你返回的对象的原型(prototype)。第二种方式，使用 new 创建一个继承自 MakeMe 函数的 prototype 的对象，而使用 {} 的第一种方式只创建一个与 MakeMe 完全无关的独立对象。
我已经在两个简化的示例中展示了这一点。
function Make1(value) {
return {prop: value};
}
// Construction using {} returns a simple object that inherits nothing from Make1.
var object1 = Make1('foo');
// So I can add methods all I want...
Make1.prototype.showMe = function() {
alert(this.prop);
}
// But object1 won't get them, and the line below shows that the method is not assigned.
alert(typeof object1.showMe);
// .. and the line below will fail.
object1.showMe();function Make2(value) {
this.prop = value;
}
// Construct 'new' returns an object that inherits everything from the prototype of Make2.
var object2 = new Make2('bar');
// I can now add a method to the prototype.
Make2.prototype.showMe = function() {
alert(this.prop);
}
// And call that method for the object and any other object that was constructed
// this way. They all share this common behaviour now.
object2.showMe();现在这本身不是问题。这只是取决于你在特定情况下需要什么，你可以在你的项目中使用两者。
我不记得是从哪里学来的，所以我查找了一些“随机”来源，这些来源似乎很好地解释了这种原型(prototype)设计。
关于javascript - 请问这样创建对象有什么效果吗？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27633639/