我非常喜欢用YUI3库来做这类事情。

<div id="mydiv"> ... </div>

<script>
YUI().use('node-base', function(Y) {
  Y.on("available", someFunction, '#mydiv')
})

见:http://developer.yahoo.com/yui/3/event/ onavailable

你不能在div上添加事件onload，但你可以在文档加载时添加onkeydown并触发onkeydown事件

$（函数（） { $（“.ccsdvCotentPS”）.trigger（“onkeydown”）; }); <script src=“https://ajax.googleapis.com/ajax/libs/jquery/1.2.3/jquery.min.js”></script> <div onkeydown=“setCss（ ）;”> </div>'

我非常喜欢用YUI3库来做这类事情。

<div id="mydiv"> ... </div>

<script>
YUI().use('node-base', function(Y) {
  Y.on("available", someFunction, '#mydiv')
})

见:http://developer.yahoo.com/yui/3/event/ onavailable

避免使用任何基于间隔的方法(因为它们不是性能和准确的)，并使用MutationObserver针对动态加载div的父div以获得更好的效率。

更新:这是我写的一个方便的函数。像这样使用它:

onElementLoaded("div.some_class").then(()=>{}).catch(()=>{});

/**
 *
 * Wait for an HTML element to be loaded like `div`, `span`, `img`, etc.
 * ex: `onElementLoaded("div.some_class").then(()=>{}).catch(()=>{})`
 * @param {*} elementToObserve wait for this element to load
 * @param {*} parentStaticElement (optional) if parent element is not passed then `document` is used
 * @return {*} Promise - return promise when `elementToObserve` is loaded
 */
function onElementLoaded(elementToObserve, parentStaticElement) {
  const promise = new Promise((resolve, reject) => {
    try {
      if (document.querySelector(elementToObserve)) {
        console.log(`element already present: ${elementToObserve}`);
        resolve(true);
        return;
      }
      const parentElement = parentStaticElement
        ? document.querySelector(parentStaticElement)
        : document;

      const observer = new MutationObserver((mutationList, obsrvr) => {
        const divToCheck = document.querySelector(elementToObserve);

        if (divToCheck) {
          console.log(`element loaded: ${elementToObserve}`);
          obsrvr.disconnect(); // stop observing
          resolve(true);
        }
      });

      // start observing for dynamic div
      observer.observe(parentElement, {
        childList: true,
        subtree: true,
      });
    } catch (e) {
      console.log(e);
      reject(Error("some issue... promise rejected"));
    }
  });
  return promise;
}

实现细节:

HTML:

<div class="parent-static-div">
  <div class="dynamic-loaded-div">
    this div is loaded after DOM ready event
  </div>
</div>

JS:

var observer = new MutationObserver(function (mutationList, obsrvr) {
  var div_to_check = document.querySelector(".dynamic-loaded-div"); //get div by class
  // var div_to_check = document.getElementById('div-id'); //get div by id

  console.log("checking for div...");
  if (div_to_check) {
    console.log("div is loaded now"); // DO YOUR STUFF!
    obsrvr.disconnect(); // stop observing
    return;
  }
});

var parentElement = document.querySelector("parent-static-div"); // use parent div which is already present in DOM to maximise efficiency
// var parentElement = document // if not sure about parent div then just use whole 'document'

// start observing for dynamic div
observer.observe(parentElement, {
  // for properties details: https://developer.mozilla.org/en-US/docs/Web/API/MutationObserverInit
  childList: true,
  subtree: true,
});

你可以使用onerror在IMG元素上自动触发一些js，而不使用src。

<img src onerror='alert()'>

不，你不能。使其工作的最简单的方法是将函数调用直接放在元素之后

例子:

...
<div id="somid">Some content</div>
<script type="text/javascript">
   oQuickReply.swap('somid');
</script>
...

或者-甚至更好-就在</body>前面:

...
<script type="text/javascript">
   oQuickReply.swap('somid');
</script>
</body>

.．.因此它不会阻止以下内容的加载。