js模拟点击以提交表单为例兼容主流浏览器

<h3>请单击“提交”，测试提交按钮的单击事件也被触发了。</h3>
<button id="btn">提交</button>
<form action="#" method="get" id="form">
<input type="text" name="site" value="www.woiweb.net" readonly/>
<input id="subbtn" type="submit" value="先别点击此按钮提交" onclick="alert('我已经提交了');"/>
</form>

<script type="text/javascript">
var sub = document.getElementById("subbtn");
var btn = document.getElementById("btn");
//通用方法
btn.onclick = function() {
sub.click();
}
</script>

<h3>请单击“提交”，测试提交按钮的单击事件也被触发了。</h3>
<button id="btn">提交</button>
<form action="#" method="get" id="form">
<input type="text" name="site" value="www.woiweb.net" readonly/>
<!--<input id="subbtn" type="submit" value="先别点击此按钮提交" onclick="alert('我已经提交了');"/> -->
<a id="subbtn" href="javascript:;" onclick="alert('在此调用提交表单的方法')">模拟提交按钮</a>
</form>

<script type="text/javascript">
var sub = document.getElementById("subbtn");
var btn = document.getElementById("btn");
//通用方法
btn.onclick = function() {
sub.click();
}
</script>

<script type="text/javascript">
var sub = document.getElementById("subbtn");
var btn = document.getElementById("btn");
//通用方法
btn.onclick = function() {
//sub.click();
if (/msie/i.test(navigator.userAgent)) //IE
{
sub.fireEvent("onclick");
} else {
var e = document.createEvent('MouseEvent');
e.initEvent('click', false, false);
sub.dispatchEvent(e);
}
}
</script>