javascript - JSLint 意外 'that' 消息

Question

我刚刚开始使用 JSLint 来确保我创建的 JavaScript 代码至少符合一些标准，但我收到了一条令人困惑的消息:

JSLint: Unexpected 'that'.

该代码是实现进度条的解决方案的一部分，其中一部分是处理计时器和回调的对象，如下所示(这是从较大文件的开头摘录的内容，我可以添加整个文件如果需要):

var ProgressHandler = function () {
    "use strict";

    // Build a new object
    var that = {};

    // Add basic properties
    that.taskid = 0;
    that.timerid = 0; // Timer ID used to push refreshes
    that.progressUrl = ""; // URL to invoke to read progress
    that.interval = 500; // The interval for progress refresh
    that.taskProgressCallback = null; // The user-defined callback that refreshes the UI 
    that.taskCompletedCallback = null; // The user-defined callback that finalizes the call 

    // Set progress url
    that.setProgressUrl = function (url) {
        that.progressUrl = url;
        return this;
    }

    // Set frequency of refresh
    that.setInterval = function (interval) {
        that.interval = interval;
        return this;
    };

该消息出现在以 that.setInterval 开头的行上。 I 还有进一步的用途，但 JSLint 还表示它会在此时停止处理。我已尝试搜索此消息，但它并未在此处或 jslinterrors.com 上专门列出。

为什么会出现这种情况？我可以采取什么措施来解决它？或者应该忽略它？

Answer 1

问题似乎是在 that.setProgressUrl 的定义之后没有 ; 。更改为:

    // Set progress url
    that.setProgressUrl = function (url) {
        that.progressUrl = url;
        return this;
    };

解决了报告的问题。然后，您会遇到一个问题，因为文件末尾缺少右大括号和分号，不确定这是否只是复制和粘贴问题。完整的脚本应如下所示:

var ProgressHandler = function () {
    "use strict";

    // Build a new object
    var that = {};

    // Add basic properties
    that.taskid = 0;
    that.timerid = 0; // Timer ID used to push refreshes
    that.progressUrl = ""; // URL to invoke to read progress
    that.interval = 500; // The interval for progress refresh
    that.taskProgressCallback = null; // The user-defined callback that refreshes the UI 
    that.taskCompletedCallback = null; // The user-defined callback that finalizes the call 

    // Set progress url
    that.setProgressUrl = function (url) {
        that.progressUrl = url;
        return this;
    };

    // Set frequency of refresh
    that.setInterval = function (interval) {
        that.interval = interval;
        return this;
    };
};