<input type="file" id="file1" name="file1" onchange="preImage(1,this.files);"
accept="image/*">
function preImage(index, files) {
var f = files[0];
var extension = new String(f.name.substring(
f.name.lastIndexOf(".") + 1, f.name.length).toLowerCase());//文件扩展名
var strtype = "gif|jpg|jpeg|png|bmp|";
}
获取到的f.name是64且没有扩展名,获取到的value是c:\fakepath\64