传真5 如果档案存在,可进行传真简单的核对
原文：HTML5 File API simple check if file exists
原文：HTML5 File API simple check if file exists
我有一份临时文件APICA储存(HTML5),但我可以检查是否存在档案。 是否有简单的检查方法? 我是否必须实际尝试和阅读档案,以找出问题?
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