js点击按钮实现文件上传

点击按钮实现文件上传


<!DOCTYPE HTML>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <script src="./jquery.min.js" type="text/javascript"></script>
    <title>点击按钮实现文件上传</title>
</head>
<body>
<input type="file" name="upload" id="upload" style="display: none;" />
<input type="button" id="uploadFileButton" value="文件上传" />
<br /><br /><span id="uploadFileName"></span>
<script type="text/javascript">
    $('#uploadFileButton').click(function () {
        $('#upload').click();
    });
    $('#upload').click(function () {
        $('#upload').val('');
    });
    $('#upload').on('change', function(){
        var fileNameStr = $('#upload').val();
        var index2 = fileNameStr.length;
        if(fileNameStr.indexOf("/") != -1) {
            var index1 = fileNameStr.lastIndexOf("/");
        } else {
            var index1 = fileNameStr.lastIndexOf("\");
        }
        if (index1 <= -1) {
            index1 = 0;
        } else {
            index1 += 1;
        }
        fileNameStr = fileNameStr.substring(index1, index2);
        $('#uploadFileName').html(fileNameStr);
    });
</script>
</body>
</html>