js里onload事件会执行几次? 编程，JavaScript中的onload无法多次调用，求解...
js\u91cconload\u5230\u5e95\u662f\u5e72\u561b\u7684\uff1fonload\uff0c\u5b57\u9762\u610f\u601d\u5c31\u662f\u52a0\u8f7d\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728\u52a0\u8f7d\u5b8c\u6210\u540e\u6267\u884c\uff0c\u8fd9\u4e2a\u4e8b\u4ef6\u4e0d\u662f\u7528\u5230\u54ea\u91cc\u90fd\u53ef\u4ee5\u7684\uff0c\u53ea\u6709\u51e0\u4e2a\u6807\u7b7e\u652f\u6301\u5b83\uff1a, , , , , , \u8fd9\u51e0\u4e2a\u6807\u7b7e\u662f\u652f\u6301\u8fd9\u4e2a\u4e8b\u4ef6\u7684\uff0c\u62ff\u6765\u8bf4\u5427\uff0c\u5982\u679c\u7528\u4e0aonload\u4e4b\u540e\u5c31\u4ee3\u8868\uff0c\u5f53\u56fe\u7247\u52a0\u8f7d\u5b8c\u6210\u540e\u6267\u884c\u67d0\u4e00\u4e2a\u65b9\u6cd5\u3002\u6bd4\u5982\u53ef\u4ee5\u7528\u6765\u68c0\u6d4b\u52a0\u8f7d\u56fe\u7247\u7528\u4e86\u591a\u4e45\uff0c\u5c31\u53ef\u4ee5\u8bbe\u7f6e\u4e00\u4e2a\u53d8\u91cf\u6765\u8bb0\u5f55\u52a0\u8d5e\u5b8c\u6210\u7684\u65f6\u95f4\uff0c\u7136\u540e\u548c\u52a0\u8f7d\u56fe\u7247\u5f00\u59cb\u65f6\u7684\u65f6\u95f4\u5bf9\u6bd4\uff0c\u8ba1\u7b97\u51fa\u52a0\u8f7d\u8fd9\u5f20\u56fe\u7247\u6240\u7528\u7684\u65f6\u95f4\u662f\u591a\u5c11\u3002
\u4e0d\u4f46onload\uff0c\u6240\u6709\u4e8b\u4ef6\u90fd\u4e00\u6837\uff0c\u5982\u679c\u540c\u4e00\u4e2a\u4e8b\u4ef6\u4f60\u5199\u4e86\u591a\u4e2a\u89e6\u53d1\u7684\u51fd\u6570\uff0c\u90a3\u4e48\u5b83\u53ea\u4f1a\u8fd0\u884c\u4e00\u4e2a\u7684\u3002
\u8981\u60f3\u5b9e\u73b0\u591a\u6b21\u89e6\u53d1\uff0c\u5fc5\u987b\u4f7f\u7528addEventListener--\u201c\u6dfb\u52a0\u4e8b\u4ef6\u76d1\u542c\u201d\u7684\u65b9\u6cd5\uff1a
window.addEventListener('load',\u51fd\u65701,false);
window.addEventListener('load',\u51fd\u65702,false);
\u8981\u6ce8\u610f\uff0c\u8fd9\u4e24\u4e2a\uff08\u6216\u8005\u66f4\u591a\uff09\u8bed\u53e5\u53ef\u4ee5\u653e\u5728\u9875\u9762\u7684\u4e0d\u540c\u5730\u65b9\uff08\u751a\u81f3\u53ef\u4ee5\u662f\u4e0d\u540c\u7684js\u6587\u4ef6\u5185\uff09\uff0c\u5f53\u7f51\u9875\u52a0\u8f7d\uff08onload\uff09\u65f6\uff0c\u8fd9\u4e9b\u51fd\u6570\u5c31\u4f1a\u9010\u4e00\u8fd0\u884c\u4e86\u3002
\u4f46\u662f\uff0c\u4e0a\u8ff0\u65b9\u6cd5\u5728IE\u4e2d\u65e0\u6548\uff0cIE\u4e2d\u8981\u7528attachEvent\uff0c\u800c\u4e14\u7528\u6cd5\u4e5f\u4e0d\u540c\uff1a
window.attachEvent('onload',\u51fd\u65701);
window.attachEvent('onload',\u51fd\u65702);
执行一次。
function addLoadEvent(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function () {
oldonload();
func();
}
}
}
function addload() {
alert("addload");
}
// 执行到这里的时候直接弹出onload，与onload事件无关
window.onload = alert("onload");
// 监听onload事件，所以onload事件触发之后才会弹出addload
addLoadEvent(addload);
// 执行到这里的时候直接弹出last，与onload事件无关
alert("last");
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绛旓細鍙互銆 閮藉彲浠 浣犺瘯涓嬶紒锛
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