js 获取页面表单的个数

<code class="language-html">

<form name="form1" method="post" action="">
    <input type="text" name="textfield">
</form>
<form name="form2" method="post" action="">
    <input type="button" value="Only a sample button" onclick="return false"> 
</form>
<form name="form3" method="post" action="">
    <input type="checkbox" name="checkbox" value="checkbox">
</form>
<button onclick="function1()">Click here</button>
<script language="JavaScript">
function function1() {
    var m = document.forms.length;
    console.log("There are "+m+" forms in this document") 
} 
</script>

</code>