JS判断当前DOM树是否加载完毕

/**
 * @function Monitor whether the document tree is loaded.
 * @param fn
 */
function domReady(fn) {
 ???if (document.addEventListener) { // 标准浏览器
 ???????document.addEventListener(‘DOMContentLoaded‘, function () { //注销时间，避免重复触发
 ???????????document.removeEventListener(‘DOMContentLoaded‘, arguments.callee, false);
 ???????????fn(); // 运行函数
 ???????}, false);
 ???} else if (document.attachEvent) { // IE浏览器
 ???????document.attachEvent(‘onreadystatechange‘, function () {
 ???????????if (document.readyState == ‘complete‘) {
 ???????????????document.detachEvent(‘onreadystatechange‘, arguments.callee);
 ???????????????fn(); // 函数运行
 ???????????}
 ???????});
 ???}
}

domReady(loadStart);

JS判断当前DOM树是否加载完毕

原文地址：https://www.cnblogs.com/Man-Dream-Necessary/p/8780436.html