要判断这个 CSS 文件是否加载完毕,各个浏览器的做法差异比较大,这次要说IE浏览器做的不错,我们可以直接通过onload方法来处理CSS加载完成以后的处理:

// 代码节选至seajs
function styleOnload(node, callback) {
    // for IE6-9 and Opera
    if (node.attachEvent) {
      node.attachEvent('onload', callback);
      // NOTICE:
      // 1. "onload" will be fired in IE6-9 when the file is 404, but in
      // this situation, Opera does nothing, so fallback to timeout.
      // 2. "onerror" doesn't fire in any browsers!
    }
} 
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