1-添加上传前回调。2-上传成功事件带上off函数用于重置组件。3-调整file参数位置，适应oss 上传#188
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kunrui wants to merge 5 commits intodai-siki:masterfrom
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1-添加上传前回调。2-上传成功事件带上off函数用于重置组件。3-调整file参数位置，适应oss 上传#188kunrui wants to merge 5 commits intodai-siki:masterfrom
kunrui wants to merge 5 commits intodai-siki:masterfrom
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Commits on Aug 23, 2019
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