简单教程
提交运行
代码编辑器:
<p>请输入 5 到 10 之间的数:</p> <input id="demo" type="text"> <button type="button" onclick="myFunction()">检测输入</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 "为空"; if(isNaN(x)) throw "不是一个数字"; if(x > 10) throw "太大"; if(x < 5) throw "太小"; } catch(err) { message.innerHTML = "输入的值 " + err; } finally { document.getElementById("demo").value = ""; } } </script>
运行结果: