我想了解如何通过JavaScript中的文件来分解功能。我试图把名字空间看作单例类。我不明白为什么在下面的代码中,MODULE_A.privateMethod1()
会抛出错误:Uncaught TypeError: undefined is not a function
。当我打开记录的对象时,我看不到那里的私有方法。无法从javascript命名空间调用'private'方法?
的index.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Test Project</title>
<script src="index.js"></script>
<script src="moduleA.js"></script>
</head>
<body>
<div>
hi
</div>
</body>
</html>
index.js:
(function() {
var initializeWindow = function() {
console.log("initializeWindow");
MODULE_A.publicMethod1();
};
window.addEventListener('load', initializeWindow);
})();
moduleA.js:
// "Singleton Class"
var MODULE_A = (function() {
// ---------------------------------------------------------------------------
// "Private" Class Constants
// ---------------------------------------------------------------------------
var A_CONSTANT_NUMBER = 1;
// ---------------------------------------------------------------------------
// "Private" Class Variables (Properties)
// ---------------------------------------------------------------------------
var myPrivateVar_ = 2;
// ---------------------------------------------------------------------------
// "Private" Methods
// ---------------------------------------------------------------------------
var privateMethod1 = function() {
console.log("A.privateMethod1");
};
var privateMethod2 = function() {
console.log("A.privateMethod2");
};
return {
// ---------------------------------------------------------------------------
// "Public" Class Variables (Properties)
// ---------------------------------------------------------------------------
aPublicVar1: 3,
// ---------------------------------------------------------------------------
// "Public" Methods
// ---------------------------------------------------------------------------
publicMethod1: function() {
console.log("A.publicMethod1");
this.publicMethod2();
// ERROR HERE!!!
this.privateMethod1();
this.privateMethod2();
},
publicMethod2: function() {
console.log("A.publicMethod2");
}
}
})();
删除'this.'部分。您尝试访问的功能不是您要返回的对象的一部分,因为它们不应该是公开的。它们是模块IIFE内的*局部变量*。 – 2014-10-01 01:15:35
最近的重复? http://stackoverflow.com/questions/3127429/javascript-this-keyword – elclanrs 2014-10-01 01:16:32
我试着用'''MODULE_A.'''替换'''this.''',并且仍然出现同样的错误 – tarabyte 2014-10-01 01:21:39