Uncaught TypeError: upload is not a function at HTMLInputElement.onchange

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/loveyour_1314/article/details/81478734

js 中标签的id名称不能和方法名一样，

<input type="file" id="upload" onchange="upload()">改为
<input type="file" id="uploadpic" onchange="upload()">