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[js] 第521天 请说说以下两种原型的区别 #2924

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haizhilin2013 opened this issue Sep 17, 2020 · 1 comment
Open

[js] 第521天 请说说以下两种原型的区别 #2924

haizhilin2013 opened this issue Sep 17, 2020 · 1 comment
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@haizhilin2013
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第521天 请说说以下两种原型的区别

作者:CHWYH

3+1官网

我也要出题

var A = function() {};
var b = new A();
A.prototype = {
	n: 0,
	m: 1
}
和以下方式的声明有什么区别,为什么?

var A = function() {};
var b = new A();
A.prototype.n = 0;
A.prototype.m = 1;
@haizhilin2013 haizhilin2013 added the js JavaScript label Sep 17, 2020
@longhui520
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  • 前者是重置了A的原型为一个新对象,后者是在A现有原型上添加属性

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