js 读取文件

读取文本文件

    读取文本文件：

    <input type="file" id="file1" accept="*" />

</div>

<div>

    显示进度：

    <progress id="pro" value=""></progress>

</div>

<div id="result"></div>

<script type="text/javascript">

        var file1 = document.getElementById('file1');

        file1.onchange = function () {

            var file = file1.files[];

            //读取为二进制

            var reader = new FileReader();

            reader.readAsText(file,'utf-8');

            //reader.readAsBinaryString(file);

            //显示进度

            var pro = document.getElementById('pro');

            pro.max = file.size;

            pro.value = ;

            reader.onprogress = function (e) {

                pro.value = e.loaded;

            }

            reader.onload = function () {

                document.getElementById('result').innerHTML = reader.result;

            }

        }

</script>

读取二进制文件

    读取文本文件：

    <input type="file" id="file1" accept="*" />

</div>

<div>

    显示进度：

    <progress id="pro" value=""></progress>

</div>

<div id="result"></div>

<script type="text/javascript">

        var file1 = document.getElementById('file1');

        file1.onchange = function () {

            var file = file1.files[];

            //读取为二进制

            var reader = new FileReader();

            reader.readAsText(file,'utf-8');

            //reader.readAsBinaryString(file);

            //显示进度

            var pro = document.getElementById('pro');

            pro.max = file.size;

            pro.value = ;

            reader.onprogress = function (e) {

                pro.value = e.loaded;

            }

            reader.onload = function () {

                document.getElementById('result').innerHTML = reader.result;

            }

        }

</script>

预览图片

预览图片：

        <input id="images" type="file" multiple accept="image/*" />

        <script type="text/javascript">

            var imgInput = document.getElementById('images');

            imgInput.onchange = function () {

                //1.获取所有选中文件列表

                var fileList = imgInput.files;

                //2.遍历显示信息

                for (var i = ; i < fileList.length; i++) {

                    var file = fileList[i];

                    //一次读取文件的文件名，文件类型，文件大小

                    var div = document.createElement('div');

                    div.innerHTML = "第" + (i + ) + "个文件的文件名：" +

                        file.name

                        + ",文件类型：" + file.type

                        + "，文件大小：" + file.size;

                    //添加到 body中

                    document.body.appendChild(div);

                }

            }

        </script>

读取图片并展示

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>简单的html5 File测试 for pic2base64</title>

<script>

window.onload = function(){

var input = document.getElementById("demo_input");

var result= document.getElementById("result");

var img_area = document.getElementById("img_area");

if ( typeof(FileReader) === 'undefined' ){

    result.innerHTML = "抱歉，你的浏览器不支持 FileReader，请使用现代浏览器操作！";

    input.setAttribute( 'disabled','disabled' );

} else {

    input.addEventListener( 'change',readFile,false );}

}

function readFile(){

    var file = this.files[];

    console.log(file);

    //这里我们判断下类型如果不是图片就返回 去掉就可以上传任意文件

    if(!/image\/\w+/.test(file.type)){

    alert("请确保文件为图像类型");

    return false;

}

var reader = new FileReader();

reader.readAsDataURL(file);

reader.onload = function(e){

   // result.innerHTML = '<img src="'+this.result+'" alt=""/>';

    img_area.innerHTML = '<div class="sitetip">图片img标签展示：</div><img src="'+this.result+'" alt=""/>';

}

}

</script>

</head>

<body>

<input type="file" value="sdgsdg" id="demo_input" />

<textarea id="result" rows= cols=></textarea>

<p id="img_area"></p>

</body>

</html>

读取图片并展示

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>简单的html5 File测试 for pic2base64</title>

<body>

<p>

   <label>请选择一个图像文件：</label>

   <input type="file" id="file_input" />

</p>

<div id="result"></div>

</body>

<script>

var result = document.getElementById("result");

var input = document.getElementById("file_input"); 

if(typeof FileReader==='undefined'){

    result.innerHTML = "抱歉，你的浏览器不支持 FileReader";

    input.setAttribute('disabled','disabled');

}else{

    input.addEventListener('change',readFile,false);

}

function readFile(){

    var file = this.files[];

    if(!/image\/\w+/.test(file.type)){

        alert("文件必须为图片！");

        return false;

    }

    var reader = new FileReader();

    reader.readAsDataURL(file);

    reader.onload = function(e){

        result.innerHTML = '<img src="'+this.result+'" alt=""/>'

    }

}

</script>

</html>

获得blod 路径并使用

<!DOCTYPE html>

<html lang="en" >

    <head>

        <title>files</title>

    </head>

    <body>

        <img id = 'img1' src="" alt="bukejian"/>

        <input type="file" id="files" onchange="readFile()" />

        <p id="out"></p>

    </body>

    <script  >

        function readFile(){

            var a = document.createElement('a');

            var img2 = document.createElement('img');

            var uri = document.getElementById('files').files[];

            var url = window.URL.createObjectURL(uri);

            a.href=url;

            url=a.href;

            alert(url);

            document.getElementById('img1').src=url;

            //document.getElementById('out').innerHTML=uri;

        }

    </script>

</html>

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