<p id="btn1" itemid='1'>1</p> <p id="btn2" itemid="2">2</p> <p id="btn3" itemid="3">4</p> <p id="btn4" itemid="4">4</p> <button id="subbtn">提交</button> <script type="text/javascript"> var btn = document.getElementsByTagName('p'); var itemid = []; for(var i=0,len=btn.length;i<len;i++) { (function(index){ var _this = btn[index]; _this.onclick = function(){ _this.style.background = '#ccc'; if(_this.className!=='checked') { } _this.className = 'checked'; itemid.push(_this.getAttribute('itemid')); }})(i) } subbtn.onclick = function(){ alert(itemid.join(',')); } </script>