怎样将一个文本框中用户输入的数字提出来进行判断

个回答

zzluyao

2016-11-01 17:38:25

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="#">
<input id="score" type="number" value="70" name="score" max="100" min="0">
<button type="submit" onclick="myScore()">修改你的成绩</button>
</form>
<script type="text/javascript">
function myScore() {
var x = document.getElementById("score").value;
if(x > 60) {alert("及格了不用挨屁屁了")}
else {alert("你没及格啊");
}
</script>
</body>
</html>

0

夜还没黑: 2016-08-26 10:05:17

用我这个试试吧
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>判断语句</title>
  <script type="text/javascript">
	var score =document.getElementById("score").value; //score变量存储成绩，初值为80
    function getmessage(){
	  if(score>60)
	{
     document.write("很棒，成绩及格了。");
	}
  else
	{
	 document.write("加油，成绩不及格。");
	}
    }
  </script>
</head>
<body>
<input type="text" id="score"/>
<input type="submit" name="s" value="提交" onclick="getmessage()"/>
</body>
</html>

营养米线

2016-07-18 21:28:24

就是下面的代码，火狐，IE，Opera都行不通，点了确认就清空了而且没有任何提醒
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script language="javascript" type="text/javascript">
function check(){
var score=document.getElementById("tx").value;
if(score>=60){
alert("succeful");
<br/>
}else{
alert("fail");
}
}
</script>
</head>
<br/>

<body>
<form>
<input name="" type="text" id="tx"/>
<input type="submit" name="button" id="button" value="提交" onclick="check()"/>
</form>
</body>
</html>

0
codechris

2016-07-18 17:29:56

啊，不可能啊，我昨天用CHROME有反应的

0
codechris

2016-07-17 16:54:30

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script language="javascript" type="text/javascript">

function check(){
var score=document.getElementById("tx").value;
if(score>=60){
alert("succeful");
}else{
alert("fail");
}
}

</script>
</head>
<body>
<form>
<input name="" type="text" id="tx"/>
<input type="submit" name="button" id="button" value="提交" onclick="check()"/>
</form>

</body>

</html>
实例代码

1
MrDarkHorse

2016-07-17 16:00:28

用ID 然后使用getElementById("id").value;

0
慕粉3627378

2016-07-17 15:57:00

用var定义，然后用if else应该就可以了

0