4 examples of 'javascript insertbefore' in JavaScript

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47function insertScript() {
48 window.urlfix_groupID = document.URL.replace(/^.+id=/,'').replace('#', '');
49 window.urlfix_groupSite = window.urlfix_grouplist[window.urlfix_groupID];
50 window.urlfix_openSuggBox = function(){var suggboxurl = "http://mufix.herokuapp.com/form?group=" + urlfix_groupID; if(urlfix_groupSite !== "undefined") suggboxurl += "&update=yes"; window.open(suggboxurl, '', 'scrollbars=no,resizable=yes, width=700,height=200,status=no,location=no,toolbar=no');};
51 var urlfix_site = document.createElement('tr');
52 urlfix_site.innerHTML = '<td class="text"><u>Site</u><a href="#" onclick="urlfix_openSuggBox();"> (Suggest an update)</a></td><td class="text"><a target="_blank" alt="" href="' + urlfix_groupSite + '"><u>' + urlfix_groupSite + '</u></a></td>';
53 var urlfix_irc_par = document.getElementById("fixed_irc_url").parentNode;
54 urlfix_irc_par.parentNode.insertBefore(urlfix_site, urlfix_irc_par.nextSibling);
55}
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7function insertBeforeFirst()
8{
9 var container = document.getElementById("container");
10 var child = document.createElement("div");
11 child.setAttribute("id", "child-before");
12 container.insertBefore(child, container.firstChild);
13}
12export function insertBefore(parent, child, before) {
13 parent.insertBefore(child, before)
14}
252insertBefore(index, ...items) {
253 // 数组范围之外
254 if(index < 0 || index >= this.length) return ;
255 // 当前节点
256 let cur = this.at(index);
257 items.forEach((item) => {
258 // 上一个节点
259 let prev = this.chain[cur.prev] || {index: -1};
260 // 下一个节点
261 let next = cur;
262 // 插入新节点
263 cur = this.chain[this.FREE] = {
264 index: this.FREE,
265 prev: prev.index,
266 next: next.index,
267 data: item
268 }
269 next.prev = cur.index;
270 // 上一个节点存在
271 if(prev.index !== -1) {
272 prev.next = cur.index;
273 }
274 // 插入的是头节点
275 else {
276 this.HEAD = cur.index;
277 }
278 // 创建一个 FREE
279 this.calloc();
280 // 链表长度 +1
281 ++this.length;
282 })
283}

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