Throw 语句

2017-06-19 15:38:00
admin
原创
503
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>

<p>请输出一个 5 到 10 之间的数字:</p>

<input id="demo" type="text">
<button type="button" onclick="myFunction()">测试输入</button>
<p id="message"></p>

<script>
function myFunction() {
    var message, x;
    message = document.getElementById("message");
    message.innerHTML = "";
    x = document.getElementById("demo").value;
    try { 
        if(x == "")  throw "值为空";
        if(isNaN(x)) throw "不是数字";
        x = Number(x);
        if(x < 5)    throw "太小";
        if(x > 10)   throw "太大";
    }
    catch(err) {
        message.innerHTML = "错误: " + err;
    }
}
</script>

</body>
</html>
  • QQ讨论群
  • 关注微信
    • 欢迎咨询
    • 欢迎加入QQ群 16506021
  • 公众号:源宝网络