$(".down-list1 .down-left a").each(function (k, v) {
var files = $(v).attr("href");
//console.log(files);
var point = files.lastIndexOf(".");
var type = files.substr(point);
if (type == ".ppt" || type == ".pptx" || type == ".pdf") {
$(v).find("img").attr("src", "/_upload/tpl/0f/c8/4040/template4040/images/pdf.png")
}
})
