图（1）
图（2）
代码如下：
<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery图片上传预览（不经过后端处理）</title> <script src="https://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script> <style> </style> </head> <body> <div> <img/> <input type="file" /> </div> <div> <img/> <input type="file" /> </div> <script> jQuery.fn.extend({ uploadPreview: function(opts) { var _self = this, _this = $(this); opts = jQuery.extend({ Img: "ImgPr", Width: 100, Height: 100, ImgType: ["gif", "jpeg", "jpg", "bmp", "png"], Callback: function() {} }, opts || {}); _self.getObjectURL = function(file) { var url = null; if (window.createObjectURL != undefined) { url = window.createObjectURL(file) } else if (window.URL != undefined) { url = window.URL.createObjectURL(file) } else if (window.webkitURL != undefined) { url = window.webkitURL.createObjectURL(file) } return url }; _this.change(function() { if (this.value) { if (!RegExp("\.(" + opts.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) { alert("选择文件错误,图片类型必须是" + opts.ImgType.join("，") + "中的一种"); this.value = ""; return false } //高版本Jquey使用 if ($.support.leadingWhitespace) if ($.support.leadingWhitespace) { //低版本jquery中使用$.browser.msie console.log(_self.getObjectURL(this.files[0])); try { _this.parent('div').find("." + opts.Img).attr('src', _self.getObjectURL(this.files[0])); } catch (e) { var src = ""; var obj = _this.parent('div').find("." + opts.Img); var div = obj.parent("div")[0]; _self.select(); if (top != self) { window.parent.document.body.focus() } else { _self.blur() } src = document.selection.createRange().text; document.selection.empty(); obj.hide(); obj.parent("div").css({ 'filter': 'progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)', 'width': opts.Width + 'px', 'height': opts.Height + 'px' }); div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src } } else { _this.parent('div').find("." + opts.Img).attr('src', _self.getObjectURL(this.files[0])) } opts.Callback() } }) } }); $(".up").click(function(){ $(this).uploadPreview({ Img: "ImgPr" }); }) </script> </body> </html>