<!DOCTYPE html>
<html><head><meta charset="utf-8"><title>捕獲異常</title></head><script type="text/javascript">function my_func(){try{x=document.getElementById("input_id").value;alert(x);if(x==""||x==null) throw "非空";if(isNaN(x)) throw "必須是數字";if(x<5) throw "數字太小";if(x>10) throw "數字太大";else throw "輸入正確";}catch(err){document.getElementById("demo").innerHTML="提示："+err;}}</script><body><p>請輸入5——10之間的數字</p><input type="text" id="input_id"> </input><button type="button" id="button_id" οnclick="my_func()">確定</button><p id = "demo"></p> </body>
</html>
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