客户端js判断文件类型和文件大小即限制上传大小 

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript">
var isIE = /msie/i.test(navigator.userAgent) && !window.opera;
function fileChange(target, id) {
    var fileSize = 0;
    var filetypes = [".jpg", ".png", ".rar", ".txt", ".zip", ".doc", ".ppt", ".xls", ".pdf", ".docx", ".xlsx"];
    var filepath = target.value;
    var filemaxsize = 1024 * 2; //2M
    if (filepath) {
        var isnext = false;
        var fileend = filepath.substring(filepath.indexOf("."));
        if (filetypes && filetypes.length > 0) {
            for (var i = 0; i < filetypes.length; i++) {
                if (filetypes[i] == fileend) {
                    isnext = true;
                    break;
                }
            }
        }
        if (!isnext) {
            alert("不接受此文件类型！");
            target.value = "";
            return false;
        }
    } else {
        return false;
    }
    if (isIE && !target.files) {
        var filePath = target.value;
        var fileSystem = new ActiveXObject("Scripting.FileSystemObject");
        if (!fileSystem.FileExists(filePath)) {
            alert("附件不存在，请重新输入！");
            return false;
        }
        var file = fileSystem.GetFile(filePath);
        fileSize = file.Size;
    } else {
        fileSize = target.files[0].size;
    }

    var size = fileSize / 1024;
    if (size > filemaxsize) {
        alert("附件大小不能大于" + filemaxsize / 1024 + "M！");
        target.value = "";
        return false;
    }
    if (size <= 0) {
        alert("附件大小不能为0M！");
        target.value = "";
        return false;
    }
}

</script>
</head>
<body>
<input type="file" name="contractFileName" style="width: 500px;" onchange="fileChange(this);"/>
</body>
</html>

 

posted @ 2016-06-07 10:19  yasepix  阅读(200)  评论(0)    收藏  举报