Javascript addEventListener 和 attachEvent 有什么区别？
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What is the difference between addEventListener and attachEvent?
提问by RaJesh RiJo
This is the code i used in my page,
这是我在页面中使用的代码，
if (window.addEventListener) {
window.addEventListener("load", createIframe, false);
}
else if (window.attachEvent) {
window.attachEvent("onload", createIframe);
}
else {
window.onload = createIframe;
}
Please explain me that where my createIframefuntion get called? and what is the difference between addEventListenerand attachEvent? and what is the different between loadand onload? totally confused to find difference between addEventLisener with load and attachEvent with onload
请解释我的createIframe函数在哪里被调用？addEventListener和attachEvent之间有什么区别？load和onload 有什么区别？完全困惑地发现addEventLisener with load 和 attachEvent with onload之间的区别
回答by Hyman
Quick answer: you have to use attachEventif your browser returns undefined == window.addEventListener. Thing is the former is a non-standard JS function implemented in IE8 and previous versions, while addEventListeneris supported by IE9+ (and all the other browsers).
快速回答：attachEvent如果您的浏览器返回undefined == window.addEventListener. 事情是前者是在 IE8 及以前版本中实现的非标准 JS 功能，而addEventListenerIE9+（以及所有其他浏览器）支持。
So the big question is: are you gonna support IE8-?
所以最大的问题是：你会支持 IE8- 吗？
Margin note: window.onload = whateverwill override any attached event listeners. This is why addEventListeneris used: to add a function to the event's stack, instead of overwriting it.
边注：window.onload = whatever将覆盖任何附加的事件侦听器。这就是为什么addEventListener使用：将函数添加到事件堆栈中，而不是覆盖它。
