標籤：
定義和用法
onchange 在元素值改變時觸發。
onchange 屬性適用於：<input>、<textarea> 以及 <select> 元素。
執行個體
當值改變時檢查輸入欄位：
<input type="text" name="txt" value="Hello" onchange="checkField(this.value)">
<!DOCTYPE html><html> <head> <script language="javascript" type="text/javascript"> function checkField(val) { alert("輸入值已更改。新值是：" + val); } </script> </head> <body> <p>請修改輸入欄位中的文本，然後在欄位外點擊以觸發 onchange。</p> 請輸入文本：<input type="text" name="txt" value="Hello" onchange="checkField(this.value)"> </body></html>
比如：
圖片上傳時，我想選中圖片之後就執行上傳邏輯
<input type=‘file‘ id=‘imgsFile‘ name=‘imgsFile‘ class="file" onchange=‘submitUpload()‘ />
HTML onchange 事件屬性
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