本文實例為大家分享了JQuery實現圖片上傳預覽與刪除的具體代碼，經測試目前滿足谷歌、火狐、360、IE6,7,8,9,10,11等瀏覽器，供大家參考，具體內容如下
1. preview.2.0.html
<!DOCTYPE html><html><head> <title>上傳圖片預覽</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <link rel="stylesheet" type="text/css" href="srdz.preview.2.0.css"> <script type="text/javascript" src="jquery.min.js"></script> <script type="text/javascript" src="srdz.preview.2.0.js"></script><script type="text/javascript"> $(function(){ var p = new ImgPreview(); p.preview({previewid:"imgupload1"}); p.preview({previewid:"imgupload2"}); });</script></head><body> <div align="center" style="width: 50%;padding: 50px 300px;" id="imgupload1"></div> <div align="center" style="width: 50%;padding: 50px 300px;" id="imgupload2"></div></body></html>2. srdz.preview.2.0.css
.btn-pic { display: block; position: relative; width: 120px; height: 40px; overflow: hidden; cursor: pointer; text-align: center;} .btn-pic-bg { border: 1px solid #ff9000; background: none repeat scroll 0 0 #ff9000; color: #ffffff; text-decoration: none;} .btn-pic span { display: block; line-height: 39px;} .ipt-bg { display: block; position: absolute; top: 0; left: 0; width: 120px; height: 40px; font-size: 100px; opacity: 0; filter: alpha(opacity=0);} .spanc{ color: red;} .drt { float: right; display: none;} .dft { float: left;}3. srdz.preview.2.0.js
function ImgPreview(){} ImgPreview.prototype.preview=function(options){ var time = new Date().getTime(); var fileid = "file" + time; var xdelid = "xdel" + time; var delid = "del" + time; var viewid = "view" + time; var htm = "" + "<div>" + "<div class='dft'>" + "<a class='btn-pic btn-pic-bg' href='javascript:void(0);'>" + "<span>上傳圖片</span>" + "<input id='" + fileid + "' type='file' name='file' class='ipt-bg' />" + "</a>" + "</div>" + "<div id='" + xdelid + "' class='drt'>" + "<a class='btn-pic btn-pic-bg' href='javascript:void(0)'>" + "<span>刪除圖片</span>" + "<input type='button' id='" + delid + "' class='ipt-bg'/>" + "</a>" + "</div>" + "</div>" + "<div id='" + viewid + "'></div>"; $("#" + options.previewid).html(htm); $("#" + fileid).bind("click",function(){ var $this =$(this); var browser={ isIE:function(ver){ var b = document.createElement('b'); b.innerHTML = '<!--[if IE ' + ver + ']><i></i><![endif]-->'; return b.getElementsByTagName('i').length === 1; } }; $this.change(function(){ var regex=/(.*)/.(jpg|jpeg|png)$/; var val = $this.val(); if(!regex.test(val)){ $("#" + viewid).html("<span class='spanc'>請選擇正確的圖片（jpg、jpeg、png）!</span>"); return; } if(browser.isIE(6)){ HanderOther($this); }else if(browser.isIE(7) || browser.isIE(8) || browser.isIE(9)){ HanderIE789($this); }else if(window.FileReader){ HanderFileReader($this); }else{ $("#" + viewid).html("<span class='spanc'>該瀏覽器不支持預覽圖片!</span>"); } function HanderFileReader($this){ var 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){ $("#" + viewid).html("<img src='"+oFREvent.target.result+"' style='width:100%;height:100%;'/>"); $("#" + xdelid).show(); }; var aFiles = $this.get(0).files; if (aFiles.length == 0) { return; } if (!rFilter.test(aFiles[0].type)) { $("#" + viewid).html("<span class='spanc'>請選擇正確的圖片（jpg、jpeg、png）!</span>"); return; } oFReader.readAsDataURL(aFiles[0]); } function HanderIE789($this){ if(options.width != null && parseInt(options.width) > 0){ $("#" + viewid).css("width",options.width + "px"); }else{ $("#" + viewid).css("width","378px"); } if(options.height != null && parseInt(options.height) > 0){ $("#" + viewid).css("height",options.height + "px"); }else{ $("#" + viewid).css("height","358px"); } $("#" + viewid).css("filter","progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src='"+GetImgSrc($this)+"')"); $("#" + xdelid).show(); } function HanderOther($this){ $("#" + viewid).html("<img src='"+$this.val()+"' style='width:100%;height:100%;'/>"); $("#" + xdelid).show(); } function GetImgSrc($this){ $this.select(); $this.blur(); var imgSrc =document.selection.createRange().text; document.selection.empty(); return imgSrc; } }); });//綁定按鈕事件 $("#" + delid).bind("click",function(){ var browser={ isIE:function(ver){ var b = document.createElement('b'); b.innerHTML = '<!--[if IE ' + ver + ']><i></i><![endif]-->'; return b.getElementsByTagName('i').length === 1; } }; if(browser.isIE(7) || browser.isIE(8) || browser.isIE(9)){ $("#" + fileid).val(''); $("#" + viewid).css("filter",""); $("#" + viewid).css("width",""); $("#" + viewid).css("height",""); $("#" + xdelid).hide(); }else{ $("#" + fileid).val(''); $("#" + viewid).empty(); $("#" + xdelid).hide(); } });};4. jquery.min.js
更多精彩內容，請點擊《jQuery上傳操作匯總》，進行深入學習和研究。
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