WooYun.org

$("#btnUpload").click(function() {
                var patn = /\.jpg$|\.jpeg$|\.gif$|\.png$/i;
                var allowString = "jpg,jpeg,gif,png";
                var wbproimage = document.getElementById("ImgPath").value;
                if (wbproimage.length > 0) {
                    var index = wbproimage.lastIndexOf("\\");
                    var filename = wbproimage.substr(index + 1);
                    if (!patn.test(filename)) {
                        alert("图片格式不正确，只能上传以下图片格式：" + allowString);
                        return false;
                    }
                } else {
                    alert("请选择图片地址!");
                    return false;
                }