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<!DOCTYPE html> <html> <body> <p>请输入一个介于 5 和 10 之间的数字：</p> <input id="demo" type="text"> <button type="button" onclick="myFunction()">测试输入</button> <p id="p01"></p> <script> function myFunction() { var message, x; message = document.getElementById("p01"); message.innerHTML = ""; x = document.getElementById("demo").value; try { if(x == "") throw "is empty"; if(isNaN(x)) throw "is not a number"; x = Number(x); if(x > 10) throw "is too high"; if(x < 5) throw "is too low"; } catch(err) { message.innerHTML = "Input " + err; } finally { document.getElementById("demo").value = ""; } } </script> </body> </html>