读取input:file的路径并显示本地图片的方法

  1. <!doctype html>   
    <html>   
    <head>   
    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" />   
    <title>Image preview example</title>   
    <script type="text/javascript">   
    var loadImageFile = (function () {   
    if (window.FileReader) {   
    var oPreviewImg = null, oFReader = new window.FileReader(),   
    rFilter = /^(?:image/bmp|image/cis-cod|image/gif|image/ief|image/jpeg|image/jpeg|image/jpeg|image/pipeg|image/png|image/svg+xml|image/tiff|image/x-cmu-raster|image/x-cmx|image/x-icon|image/x-portable-anymap|image/x-portable-bitmap|image/x-portable-graymap|image/x-portable-pixmap|image/x-rgb|image/x-xbitmap|image/x-xpixmap|image/x-xwindowdump)$/i;   
      
      
    oFReader.onload = function (oFREvent) {   
    if (!oPreviewImg) {   
    var newPreview = document.getElementById("imagePreview");   
    oPreviewImg = new Image();   
    oPreviewImg.style.width = (newPreview.offsetWidth).toString() + "px";   
    oPreviewImg.style.height = (newPreview.offsetHeight).toString() + "px";   
    newPreview.appendChild(oPreviewImg);   
    }   
    oPreviewImg.src = oFREvent.target.result;   
    };   
      
      
    return function () {   
    var aFiles = document.getElementById("imageInput").files;   
    if (aFiles.length === 0) { return; }   
    if (!rFilter.test(aFiles[0].type)) { alert("You must select a valid image file!"); return; }   
    oFReader.readAsDataURL(aFiles[0]);   
    }   
      
      
    }   
    if (navigator.appName === "Microsoft Internet Explorer") {   
    return function () {   
    alert(document.getElementById("imageInput").value);   
    document.getElementById("imagePreview").filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = document.getElementById("imageInput").value;   
      
      
    }   
    }   
    })();   
    </script>   
    <style type="text/css">   
    #imagePreview {   
     160px;   
    height: 120px;   
    filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale);   
    }   
    </style>   
    </head>   
    <body>   
    <div id="imagePreview">   
    </div>   
    <form name="uploadForm">   
    <p>   
    <input id="imageInput" type="file" name="myPhoto" onchange="loadImageFile();" /><br />   
    <input type="submit" value="Send" /></p>   
    </form>   
    </body>   
    </html>   
原文地址:https://www.cnblogs.com/wangqc/p/input_file.html