標籤：程式 catch 第一個 text oct element div ext java
<!DOCTYPE html><html><body><script>function myFunction(){try{ var x=document.getElementById("demo").value;if(x=="") throw "值為空白";if(isNaN(x)) throw "不是數字";if(x>10) throw "太大";if(x<5) throw "太小";}catch(err){var y=document.getElementById("mess");y.innerHTML="錯誤：" + err + "。";}}</script><h1>我的第一個 JavaScript 程式</h1><p>請輸入 5 到 10 之間的數字：</p><input id="demo" type="text"><button type="button" onclick="myFunction()">測試輸入值</button><p id="mess"></p></body></html>
js中的錯誤偵測
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