標籤：html文檔格式
<html>
<head>
<style type="text/css">
.class{color:red;} 類別選取器
#id {color:red;} id選取器
#id p{} id元素下面的所有p標籤
#id >p{} 直屬下層的p
#test +p{} 同級下一個p
<style>
<link rel="stylesheet" type="text/css" href=""/> 外部樣式
<script type="text/javascript">
</script>
<script type="text/javascript" src=""></script> 外部js
</head>
<body>
</body>
</html>
(function(){})() 自執行函數，頁面載入自動會先執行函數
字元處理：obj.trim 去掉空格
obj.charAt()找到字串的第幾個字元
obj.lenth()長度
切割字串 obj.substring()
HTML格式基礎
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