標籤：
三個css選取器:id選取器#test1{ }、class選取器.test2{ }、標籤選取器div{ }對三個div:<div>我是普通div</div>、<div id="test1">我是#test1</div>、<div class="test2">我是class</div>的影響，它們三個也是div標籤，所以div影響了三個的背景，用id說明針對哪個div發揮作用，比較精細，而類控制的多一些，div的範圍更大了，它影響這裡的三個選取器
id選取器、class選取器、標籤選取器、派生選取器div p{ }div下的p，衍生類別（根據元素之間的上下級關係）；
<style>
#test1{
width:100;
height:100px;
border: 1px solid red;
}
.test2{
width:100px;
height:100px;
border: 1px solid blue;
}
div{
width:100px;
height:100px;
background: pink;
margin:10px;
}
div p{
color:blue;
}
</style>
</head>
<body>
<div>我是普通div
<p>我是div下的p標籤</p>
</div>
<p>我是獨立p標籤</p>
<div id="test1">我是#test1</div>
<div class="test2">我是class</div>
</body>
css優先順序：多個選取器同時控制某個元素，而且設定了同一個css屬性，控制的越精細優先順序越高；
<style>
p{
color:red;
}
.test2{
color:bule;
}
#test1{
color:green;
}
div #test1{
color:pink;
}
</style>
</head>
<body>
<div>
<p id="test1" class="test2">css選取器</p>
</div>
</body>
css選取器及css優先順序
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