HTML部分
<form>
<input type="text" value="请输入用户名" id=”number”><br />
<input type=" button" value="提交" οnclick="checkForm()">
</form>
JS部分
方法1:
<script>
funciton checkForm(){
var obj=document.getElementById("number").value;
alert(obj)
}
</script>
方法2:
<form id ="form1" name=”form1”>
代号:<input type="text" name="a" value="1"><br>
代号:<input type="text" name="a" value="2"><br>
代号:<input type="text" name="a" value="3"><br>
<input type="submit" value="提交">
</form>
</body>
<script type="text/javascript">
document.getElementById('form1').onsubmit=function(){ // div.οnclick=function(){}
var as=document.getElementsByName('a'); //数组
for(i=0; i<as.length;i++){
alert(as[i].value);
}
}
</script>
方法3:
<script>
funciton checkForm(){
var obj=document.form1.number.value;
var obj=document.forms[0].number.value;//
var obj=document.forms[0]['number'].value;
var obj=document.form1['number'].value;
}
</script>
DOM寻址方法:
getElementById
getElementsByName
getElementsByTagName
getElementsByClassName