javascript: void ( 
 (function () { 
 var hash = {}; 
 var a = document.evaluate('//input[(@type="radio") and not(@value="0")]//@name', 
   document, 
   null, 
   XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, 
   null); 
 if (a.snapshotLength){ 
 for (var i = 0; i < a.snapshotLength; i++) { 
 if (!(a.snapshotItem(i).value in hash)) 
 hash[a.snapshotItem(i).value] = 0; 
 hash[a.snapshotItem(i).value]++; 
 } 
 for (i in hash) { 
 document.evaluate('//input[(@type="radio") and not(@value="0") and @name="' + i + '"]', 
   document, 
   null, 
   XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, 
   null).snapshotItem(Math.floor(Math.random() * hash[i])).click(); 
 } 
 } 
 var array = new Array(); 
 var as = document.getElementsByTagName("a"); 
 var preName = ""; 
 var change = false; 
 for(var i=0; i < as.length; i++){ 
 if(as[i].getAttribute("rel") != null && as[i].nextSibling.getAttribute("type") == "checkbox"){ 
 var name = as[i].nextSibling.getAttribute("name"); 
 var check = as[i].nextSibling.getAttribute("checked"); 
 if(check == "checked"){ 
  as[i].click(); 
 } 
 if(preName == "" || preName == name){ 
  if(Math.random() * 10 > 5){ 
  as[i].click(); 
  change = true; 
  } 
 } 
 var next = as[i + 1]; 
 if(next.getAttribute("rel") != null && next.nextSibling.getAttribute("type") == "checked" && next.getAttribute("name") != name){ 
  if(!change){ 
  as[i].click(); 
  } 
  change = false; 
 } 
 if(i == as.length - 1 && !change){ 
  as[i].click(); 
 } 
 preName = name; 
 } 
 } 
 var objs = document.getElementsByTagName("textarea"); 
 for (var i = 0; i < objs.length; i++){ 
 objs[i].focus(); 
 objs[i].value = "最好的意見就是沒有意見，哈哈哈哈哈哈哈"; 
 objs[i].blur(); 
 } 
 var choose = document.getElementsByTagName("select"); 
 for (var i = 0; i < choose.length; i++) { 
 choose[i].focus(); 
 choose[i].value = "1"; 
 choose[i].blur(); 
 } 
 })()); 
function validate(){return true;} 
var btn = document.getElementById("submit_button"); 
window.setTimeout(btn.click(),2000); 

if (J[0].checked || J[1].checked) { 
 alert('系統(tǒng)檢測(cè)到非法填寫問卷'); 
 window.location.href = window.location.href; 
 return; 
} 

<li > 
<a href="javascript:" rel="external nofollow" class="jqCheckbox" rel="q2_2"></a> 
<input  id="q2_2" name="q2" value="2" type="checkbox"> 
<label>選項(xiàng)8</label> 
</li>