javascript - 这是什么/*global $, window : false, document: false */

Question

为什么一些 JavaScript 开发人员将这种类型的隐藏代码放在他们的页面顶部？

 /*global $, window: false, document: false */

Answer 1

JSLint also recognizes a /*global*/ directive that can indicate to JSLint that variables used in this file were defined in other files. The directive can contain a comma separated list of names. Each name can optionally be followed by a colon and either true or false, true indicating that the variable may be assigned to by this file, and false indicating that assignment is not allowed (which is the default). The directive respects function scope. Source: http://www.jslint.com/lint.html

根据您的示例，开发人员告诉 JSLint $ 是在其他文件中定义的，window 和 document 是由浏览器定义的并且不允许分配。