00 write
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
#div1{
width: 300px;
height: 400px;
background-color: red;
}
</style>
<script>
window.onload = function(){
var oBut = document.getElementById("but")
oBut.onclick = function(){
document.write("<h1>我是標(biāo)題標(biāo)簽</h1>")
//【注】document.write() 在添加內(nèi)容的時候 會將頁面上原有的內(nèi)容覆蓋掉
}
}
</script>
</head>
<body>
<div id="div1"></div>
<button id="but">按鈕</button>
</body>
</html>
01 節(jié)點操作方法
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script>
/*
createElement()
【格式】document.createElement(標(biāo)簽名)
appendChild()
【格式】parent.appendChild(newNode)
功能：將newNode插入到parent子節(jié)點的末尾
createTextNode()
【格式】document.createTextNode(文本)
功能：創(chuàng)建文本節(jié)點
*/
window.onload = function(){
var oDiv = document.getElementById("div1")
var oBtu = document.getElementById("btu")
oBtu.onclick = function(){
//1、創(chuàng)建span節(jié)點
var node = document.createElement("span")
//alert(node) [object HTMLSpanElement]
//2毙石、給span節(jié)點中添加文本
var oText = document.createTextNode("文本內(nèi)容")
//3粥烁、將文本插入到節(jié)點中
node.appendChild(oText)
//4镀裤、將節(jié)點插入到div中
//var node = createElementWithText("span", "文本內(nèi)容")
oDiv.appendChild(node)
}
}
/*
【注】創(chuàng)建一個帶文本的元素節(jié)點
*/
function createElementWithText(tagName, txt){
var node = document.createElement(tagName)
var text = document.createTextNode(txt)
node.appendChild(text)
return node
}
</script>
</head>
<body>
<div id="div1">
<em>斜體</em>
<p>p</p>
</div>
<button id="btu">按鈕</button>
</body>
</html>
