fix: 修复外部文件拖拽在firefox浏览器或自定义handler时无法工作 #1098
Merged
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firefox浏览器的文件拖拽事件types属性为["application/x-moz-file","Files"]
在代码中使用types[0]="Files"判断是否为文件拖拽,这导致在firefox上无法识别文件拖拽
因为判断了url为空则不执行传,当使用upload.handler自定义上传处理函数,文件拖拽无法正常工作。