如何让Greasemonkey脚本在@ run-at document-start和@ run-at document-end运行?

时间:2014-10-09 01:11:24

标签: javascript greasemonkey startup

对于我的Greasemonkey脚本,在加载页面(@run-at document-start)之前应该运行部分代码,并且在加载文档之后应该运行代码的另一部分(@run-at document-end) 。
这可能吗?

  • 脚本运行的第一部分
  • 页面已加载,文档已准备就绪
  • 脚本运行的第二部分

我宁愿不使用jQuery。

我尝试了onload事件,但它没有用。如果文件还没有,我认为不能附上这个活动吗?

window.document.onload = function(e){ 
    alert("document.onload" ); 
}

1 个答案:

答案 0 :(得分:22)

您想要的活动是DOMContentLoaded。此外,这不是如何使用load事件。

这是一个完整的脚本,演示了各种触发时间:

// ==UserScript==
// @name        _Show page start event timing
// @include     http://YOUR_SERVER.COM/YOUR_PATH/*
// @run-at      document-start
// ==/UserScript==
console.log ("==> Script start.", new Date() );

// 1ST PART OF SCRIPT RUN GOES HERE.
console.log ("==> 1st part of script run.", new Date() );

document.addEventListener ("DOMContentLoaded", DOM_ContentReady);
window.addEventListener ("load", pageFullyLoaded);

function DOM_ContentReady () {
    // 2ND PART OF SCRIPT RUN GOES HERE.
    // This is the equivalent of @run-at document-end
    console.log ("==> 2nd part of script run.", new Date() );
}

function pageFullyLoaded () {
    console.log ("==> Page is fully loaded, including images.", new Date() );
}

console.log ("==> Script end.", new Date() );

典型结果:

"==> Script start."                           2014-10-09T01:53:49.323Z
"==> 1st part of script run."                 2014-10-09T01:53:49.323Z
"==> Script end."                             2014-10-09T01:53:49.323Z
"==> 2nd part of script run."                 2014-10-09T01:53:49.385Z
"==> Page is fully loaded, including images." 2014-10-09T01:53:49.487Z