每次获取这两个值,判断是否都为空
<!doctype html><html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<input id="inp1"><input id="inp2"><button onclick="fn()">判断</button>
<script>
var val1,
val2
function fn(){
val1 = document.getElementById('inp1').value
val2 = document.getElementById('inp2').value
if(!val1 && !val2){
alert('两个都为空')
}
}
</script>
</body>
</html>
<script language="javascript" type="text/javascript">function dosubmit(){
if(document.myform.TEXT_A.value==""&&document.myform.TEXT_B.value==""){
alert("有一项为空")
return false
}
return true
}
</script><form name="myform" onsubmit="return dosubmit()">
<input name="TEXT_A" type="text" />
<input name="TEXT_B" type="text" />
<input type="submit" value="submit" />
</form>
