javascript - 我应该将 jQuery 文档包装在自执行函数中吗？

Question

我想做这样的事情:

(function(window, undefined){
    $ = window.jQuery;
    $(function(){
        // Do some stuff
    });     
})(this);

您认为这种做法是好还是坏？它对 jQuery(document).ready() 何时触发有任何影响吗？

Answer 1

我想说的唯一原因是，如果您在 DOM 准备就绪之前需要运行一些 javascript，并且您不想污染全局命名空间。

(function(window, undefined){
    var $ = window.jQuery;

    // create some variables and/or functions that shouldn't be global
    //    ...and do some work before the "ready()" fires
    var a = 'some value';
    function b() {
        // do some important stuff
    }
    var c = b();

    // Maybe set up a `.live()` handler, which doesn't rely on DOM ready.
    $('.someSelector').live( function() {
        // Some handler code.
        // This works before DOM is ready.
    });

    $(function(){
        // Your DOM ready code
    });     
})(this);