14.dom-创建 删除 替换<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Title</title><style>.box {width: 200px;height: 200px;border: 1px solid red;}</style></head><body><div class="box"><p>1111</p><p>2222</p><p>3333</p><p>4444</p></div><script>// 创建元素var oDiv = document.createElement('div')// console.log(oDiv)oDiv.style.width = '50px'oDiv.style.height = "50px";oDiv.style.backgroundColor = 'red'// 末尾添加元素var box = document.getElementsByClassName('box')[0]box.appendChild(oDiv)// 插入子元素// box.insertBefore(新节点, 某个节点)var p3 = document.getElementsByTagName("p")[2]// console.log(p3)box.insertBefore(oDiv, p3)// 删除子元素// var p4 = document.getElementsByTagName('p')[3]// box.removeChild(p4)// 替换子元素var p5 = document.getElementsByTagName('p')[3]// 寻找第四个p标签console.log(p5)box.replaceChild(oDiv, p5)</script></body></html>15.dom-修改元素属性<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Title</title><style>.box {width: 200px;height: 200px;border: 1px solid red;}</style></head><body><div class="box" name="123213123" style="background-color: pink"><div class="box2"></div><p>333333</p></div><img src="http://www.xxx.com/1.png" ><p id="ppp" name="new attribute">4444444</p><!--<input type="text">--><script>// 修改子元素var box=document.getElementsByClassName("box")[0]box.innerText="哈哈哈"box.innerHTML="<p>1111</p>"box.innerText="<p>哈哈哈哈啊</p>"// 会覆盖之前的标签// 属性操作var res=box.getAttribute("name")var res=box.setAttribute("x","11111")box.removeAttribute("class")console.log(res)box.setAttribute("style","background-color: red;width:100px")// 样式操作box.style.fontSize="50px"box.style.backgroundColor="red"// 默认属性操作var img = document.getElementsByTagName('img')[0]console.log( img.getAttribute("src"))console.log(img.src)var p=document.getElementById("ppp")alert(p.innerText)var inp = document.getElementsByTagName('input')[0]alert(inp.getAttribute("value"))alert(inp.value)var p=document.getElementById("ppp")alert(ppp.name)</script></body></html>16.dom-类元素操作<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Title</title><style>div {width: 200px;height: 200px;border: 1px solid red;}.box {background-color: red;}.box3 {width: 300px;height: 300px;}</style></head><body><div>11111</div><hr><div>2222</div><hr><div class="box22222">3333</div><script>// 设置类属性var arr=document.getElementsByTagName('div')for (var i=0;i<arr.length;i++){arr[i].classList.add("box")}var oDiv=document.getElementsByClassName("box3")[0]oDiv.classList.remove('box3')var oDiv=document.getElementsByClassName("box3")[0]alert(oDiv.classList.contains("box3"))var oDiv=document.getElementsByTagName("div")[2]oDiv.classList.toggle("box3")// 找不到box3的情况下会自动添加</script></body></html>17.模态框<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>Title</title><style>body input {/*设置成block可以居中显示*/display: block;margin: 0 auto;margin-top: 100px;background-color: pink;/*position: absolute;*//*top: 100px;*//*left: 50%;*/}.box {background-color: rgba(21,0,10,0.35);/*float: left;*//*width: 100%;*//*height: 100%;*//*绝对定位*/position: absolute;top: 0;bottom: 0;left: 0;right: 0;}.alert {width: 300px;height: 200px;background: white;/*margin: 0 auto;*//*margin-top: 100px;*//*这个好*/position: absolute;top: 100px;left: 50%;margin-left: -150px;text-align: center;line-height: 200px;}.x {width: 20px;height: 20px;background-color: red;text-align: center;line-height: 20px;float: right;}</style></head><body><input type="button" value="https://www.huyubaike.com/biancheng/点击模态框" id="btn"><script>var btn = document.getElementById('btn')btn.onclick = function (){// alert(123);测试var oDiv = document.createElement('div')oDiv.classList.add('box')// 给类绑定属性var body = document.getElementsByTagName('body')[0]// body.replaceChild(oDiv, btn);// 替换body.appendChild(oDiv)// 添加一个提示窗口var box1 = document.createElement('div')var box2 = document.createElement('div')box1.innerText = '这是一个模态框'box2.innerText = "x"box1.classList.add('alert')// 给类绑定属性. 方便添加样式box2.classList.add('x')oDiv.appendChild(box1)box1.appendChild(box2)// 给x点击事件绑定回退操作box2.onclick = function (){body.removeChild(oDiv)// 删除掉第一个窗口即可}}</script></body></html>【原生JavaScript】
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