js 选择图片生成base64数据

<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>选择图片生成base64数据</title>
    <script>
        function getUrl(file) {
            var $div = document.getElementById("text");
            var img = document.getElementById("Image");
            for (var intI = 0; intI < file.length; intI++) {//图片回显
                var tmpFile = file[intI];
                var reader = new FileReader();
                reader.readAsDataURL(tmpFile);
                reader.onload = function (e) {
                    var url = e.target.result;
                    img.src = url;
                    $div.innerHTML=url;
                }
            }
        }

    </script>
    <style>
        #text{
            width: 500px;
            border: 1px solid red;
            height: 100px;
            overflow-y: scroll;
            word-wrap:break-word ;
        }
    </style>
</head>
<body>
<input type="file" id="fileId" name="fileId" value="上传图片" onchange="getUrl(this.files);"/>
<img src="" id="Image" width="100px" height="70px">
<div id="text"></div>
</body>
</html>