OAuth 的 Javascript 范围问题

Question

我想知道如何在这一行中调用 waitForPin：

setTimeout(this.waitForPin, 100);

文件：

// namespace our code
window.App = {};

// my class (no Class.create in JQuery so code in native JS)
App.Something = function() {
};

// add functions to the prototype
App.Something.prototype = {

    // automatically called
    initialize: function(name, sound) {

        this.wnd;

        this.config = {
            // some vars
        };

        this.oauth = new OAuth(this.config);

        // attach event handlers, binding to 'this' object
        $("#request_token").click($.proxy(this.request_token, this));

    },

    request_token: function() {
        this.oauth.fetchRequestToken(this.openAuthoriseWindow, this.failureHandler);
    },

    openAuthoriseWindow: function (url) {
        this.wnd = window.open(url, 'authorise');
        setTimeout(this.waitForPin, 100); // how to call waitForPin here?
    },

    waitForPin : function (scope) {
        // do sth
    }

};

Answer 1

setTimeout(window.App.Something.waitForPin(scope), 100);

Answer 2

waitForPin 函数附加到 Something 的原型上。为了访问它，创建一个 Something 实例并调用该实例上的方法。例子

setTimeout((new App.Something()).waitForPin, 100);

Answer 3

setTimeout(this.waitForPin, 100);

这是正确的做法。

var Q = new App.Something;
Q.openAuthoriseWindow();

演示：http://jsfiddle.net/bBRPv/

Answer 4

这个怎么样：

setTimeout($.proxy(this.waitForPin, this), 100);