The differents of querySelector and getElmentbyId.
querySelector是返回指定元素節點中，子元素匹配的第一個，如果沒有匹配，則返回null。而querySelectorAll是在全文件中查詢所有匹配的項。querySelector是按照CSS來寫的，它獲取的都是靜態的元素，並且它的傳入值首位不能是數字。 獲取元素的方法有三種，分別是getElementById, getElementByClassName,getElementByTagName。它們分別返回DOM物件中對應ID，ClassName，TagName的元素。這三種方法都是動態的獲取元素。
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The differents of querySelector and getElmentbyId.
querySelector是返回指定元素節點中，子元素匹配的第一個，如果沒有匹配，則返回null。而querySelectorAll是在全文件中查詢所有匹配的項。querySelector是按照CSS來寫的，它獲取的都是靜態的元素，並且它的傳入值首位不能是數字。
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