本文实例为大家分享了JQuery实现图片上传预览与删除的具体代码，经测试目前满足谷歌、火狐、360、IE6,7,8,9,10,11等浏览器，供大家参考，具体内容如下
1. preview.2.0.html
<!DOCTYPE html>
<html>
<head>
<title>上传图片预览</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>上传图片</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>删除图片</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)){
$("#" viewid).html("<span class='spanc'>请选择正确的图片（jpg、jpeg、png）!</span>");
return;
}
if(browser.isIE(6)){
HanderOther($this);
}else if(browser.isIE(7) || browser.isIE(8) || browser.isIE(9)){
HanderIE789($this);
}else if(window.FileReader){
HanderFileReader($this);
}else{
$("#" viewid).html("<span class='spanc'>该浏览器不支持预览图片!</span>");
}
function HanderFileReader($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)) {
$("#" viewid).html("<span class='spanc'>请选择正确的图片（jpg、jpeg、png）!</span>");
return;
}
oFReader.readAsDataURL(aFiles[0]);
}
function HanderIE789($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;
}
});
});//绑定按钮事件
$("#" 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
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