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擷取表單資料的方式：
1.表單注意些id
2.使用document.getElementById("num").value 擷取值
3.一定要注意現在得到是string類型，可以用alert(typeof(num))擷取資料類型
4.使用parseInt函數將string類型轉換成int類型，然後在判斷
5.!!!!!!!!!!!!!注意要寫.value,我又忘記了，又找bug了。。。。。。
<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>js</title> <script type="text/javascript"> function getMax() { //擷取表單中的值 var num1 = parseInt(document.getElementById("num1").value); var num2 = parseInt(document.getElementById("num2").value); //輸出 // document.write((num1 > num2)? num1 : num2); alert((num1 > num2)? num1 : num2); } </script></head><body> 數字一：<input type="text" id="num1" /> 數字二：<input type="text" id="num2" /> <input type="submit" onclick="getMax()" /></body></html>
8.javascript擷取表單中兩個數字，並判斷大小
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