根據附件的後綴名來顯示相應的圖標

var obj = {}; obj["dir"] = "folder" obj["css"] = obj["txt"] = obj["js"] = "text"; obj["html"] = obj["htm"] = obj["shtml"] = obj["hta"] = "ie"; obj["xml"] = obj["xsl"] = "xml"; obj["pdf"] = "pdf"; obj[

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