例：属性中后几位字符是value就行

div [class $= yuan]{

width:200px;

height: 50px;

margin-top:10px;

background-color: cadetblue;

}

<div id="5">

<div class="yuanddd"></div>

<div class="ddddyuan"></div>//正确

<div class="jljlj-yuan"></div>//正确

</div>

eg:[src$=".pdf"] <img src="test.pdf">

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