<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>全选和反选</title></head><body> <input type="button" value="全选" id="a"><script type="text/javascript"> var a=document.getElementById("a"); a.onclick=function(){ if(this.getAttribute("value")=="全选"){ this.setAttribute("value")=="反选"; }else{ this.setAttribute("value")=="全选"; } }</script></body></html>
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