在初始化过程中自动引用函数变量的javascript正确方法
[英]javascript correct way to self-reference variables of a function during initialization
问题描述
The following works and does what I need. 
以下工作和做我需要的。 However, is there a better way to reference "a" and "b" in "c:"? 但是，是否有更好的方法在“ c：”中引用“ a”和“ b”？
<html>
<head>
<script type="text/javascript">
var bar;
function Foo() {}
Foo.prototype = {
a: 1,
b: 2,
c: function() {
return Foo.prototype.a + Foo.prototype.b;
}
}
bar = new Foo();
console.log('c is: ' + bar.c());
</script>
</head>
<body>
<button onclick="document.write('c is: ' + bar.c())">Try it</button>
</body>
</html>
2 个解决方案
解决方案1
0 2015-05-27 19:14:59
c: function() {
return this.a + this.b;
}
解决方案2
0 2015-05-27 19:38:14
When you create a new object of Foo, the properties in the constructor function and the ones added through the prototype can be access, in the objects context scope with the this word. 当创建Foo的新对象时，可以在带有this词的对象上下文范围中访问构造函数和通过原型添加的属性。
(function() {
var bar;
function Foo() {
//Constructor function properties and methods
}
//Protoytpe methods and properties
Foo.prototype = {
a: 1,
b: 2,
c: function() {
return this.a + this.b;
}
}
bar = new Foo();
console.log('c is: ' + bar.c());
})();
For more info on how the prototype works, check this out: How does JavaScript .prototype work? 有关原型工作方式的更多信息，请查看以下内容： JavaScript .prototype如何工作？
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