input美化上传按钮美化

今天工作需求碰到样式改变上传按钮

效果：

<a href="javascript:;" class="a-upload">
    <input type="file" name="" id="">点击这里上传文件
</a>

 1 <style type="text/css">
 2     .a-upload {
 3         padding: 4px 10px;
 4         height: 20px;
 5         line-height: 20px;
 6         position: relative;
 7         /*相对定位*/
 8         cursor: pointer;
 9         color: #888;
10         background: #fafafa;
11         border: 1px solid #ddd;
12         border-radius: 4px;
13         overflow: hidden;
14         display: inline-block;
15         /*显示一排*/
16         *display: inline;
17         *zoom: 1
18     }
19     
20     .a-upload input {
21         position: absolute;
22         font-size: 100px;
23         right: 0;
24         top: 0;
25         opacity: 0;
26         filter: alpha(opacity=0);
27         cursor: pointer
28     }
29     
30     .a-upload:hover {
31         color: #444;
32         background: #eee;
33         border-color: #ccc;
34         text-decoration: none
35     }
36         </style>

附带小功能：截取上传文件名：

 1     <script type="text/javascript">
 2                  $(document).ready(function(){
 3                       var  src ="";
 4                      $(".a-upload").on("change","input[type='file']",function(){
 5                          src = $(this).val();
 6                         console.log(src);
 7                         if (src.indexOf("jpg") != -1 || src.indexOf("png") != -1 ) {
 8                                $(".filetext").html("").hide();
 9                                var arr = src.split("\");
10                                var filename = arr[arr.length-1];
11                                var  name = filename.split(".");
12                                var  lastname =  name[0];
13                                $(".showfileName").html(lastname);
14                         }else{
15                                   $(".showfileName").html("");
16                                    $(".filetext").html("宁未上传文件，或者宁上传的文件类型有误")
17                         }
18                      })
19                  
20                  })
21         </script>