function getLastElementChild(obj){ if(obj.lastElementChild != undefined){ return obj.lastElementChild; }else{ var nodeLast = obj.lastChild; while(nodeLast && nodeLast.nodeType != 1){ nodeLast = nodeLast.previousSibling; } return nodeLast; } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10...
element.firstElementChild,element.lastElementChild分别返回第一个和最后一个子元素节点,IE9+ 代码: 我第一 我最后 var ul=document.querySelector("ul") console.log(ul.firstElementChild); console.log(ul.lastElementChild); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. ...
var newArray = array.filter(callback(element[,index[,array]])[,thisArg]) callback:筛选数组中每个元素的函数。返回true表示该元素保留,false则不保留。 element:数组中当前正在处理的元素。 index可选参数,正在处理的元素在数组中的索引。 array可选参数,数组本身。 2.2、WeakSet ES6中新增加的WeakSet对象的作...
AI代码解释 letcloneEl=nullletoriginalEl=nulldocument.getElementById('list').addEventListener('click',function(e){e.preventDefault()if(e.target.classList.contains('item')){originalEl=e.target// 缓存原始图DOM节点cloneEl=originalEl.cloneNode(true)// 克隆图片originalEl.style.opacity=0openPreview()/...
//innerHTML的限制://字符串最左边不能出现空白,否则会被移除//多数浏览器不会对script脚本进行执行//不能单独创建meta/style/link等myReady(function(){varcontent = document.getElementById("content");varstr = "This is a paragraph with a list following it." + "" + "Item 1" + "Item...
css(el:HTMLElement, prop:String):Mixed— get the value of style properties css(el:HTMLElement, prop:String, value:String)— set one CSS properties css(el:HTMLElement, props:Object)— set more CSS properties find(ctx:HTMLElement, tagName:String[, iterator:Function]):Array— get elements by...
alert(floats.length);//3alert(floats.buffer.byteLength);//12alert(floats[2]);//1.6180000305175781定型数组的构造函数和实例都有一个BYTES_PER_ELEMENT属性,返回该类型数组中每个元素的大小。 alert(Int16Array.BYTES_PER_ELEMENT);//2alert(Int32Array.BYTES_PER_ELEMENT);//4const ints=newInt32Array(1)...
This includes things like window.Array, window.Promise, etc. It also, notably, includes window.eval, which allows running scripts, but with the jsdom window as the global: const dom = new JSDOM(` document.getElementById("content").append(document.createElement("hr")); `, { runScripts:...
-- Or if you want a more recent canary version --><!-- -->varvideo =document.getElementById('video');if(Hls.isSupported()) {varhls =newHls(); hls.loadSource('https://video-dev.github.io/streams/x36xhzz/x36xhzz.m3u8'); hls.attachMedia(video); ...
通过id名寻找:var 标签名 = document.getElementById(id值) 通过class名寻找:var 标签名 = document.getElementByClassName(class值) 修改标签属性: 标签名.id=id属性值 标签名.className = class属性值 ... 标签名.属性名 = 属性值 修改标签样式: 标签...