js自动点击button执行onclick操作

<script type="text/javascript">//一秒后模拟点击setTimeout(function() {// IEif(document.all) {document.getElementById("parentIframe").click();}// 其它浏览器else {var e = document.createEvent("MouseEvents");e.initEvent("click", true, true);document.getElementById("parentIframe").dispatchEvent(e);}}, 1000);</script><input id="parentIframe" type="hidden" onclick="" value=''/>注意：这是id控制的//一秒后模拟点击setTimeout(function() {// IEif(document.all) {document.getElementById("parentIframe").click();}// 其它浏览器else {var e = document.createEvent("MouseEvents");e.initEvent("click", true, true);document.getElementById("parentIframe").dispatchEvent(e);}}, 1000);</script><input id="parentIframe" type="hidden" onclick="" value=''/>注意：这是id控制的