jq圖片上傳功能

//圖片上傳功能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("選擇文件錯誤,圖片類型必須是" + opts.ImgType.join("，") + "中的一種");                    this.value = "";                    return false                }                if ($.browser.msie) {                    try {                        $("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))                    } catch (e) {                        var src = "";                        var obj = $("#" + 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 {                    $("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))                }                opts.Callback()            }        })    }});//上傳圖片$("#doc").uploadPreview({ Img: "preview"});//上傳圖片