JS之Form表单相关操作

获取ID组件的值

var userid=document.getElementById('userid').value;
var cdkey=document.getElementById('cdkey').value;

提交前的检测

<form method="post" id="form2" onSubmit="return r_check()" >

　　…………

</form>

<input name="gift_num" type="text" id='gift_num' onkeyup="value=value.replace(/[^\d]/g,'')" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))">

<textarea name="yj" cols="20" rows="4" id="code_con" style="width:200px; overflow-y:visible; margin-top:30px; display:none " /> </textarea>