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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()">
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()">