JQuery 修改密码

<div id="password_edit_block" class="hide account_edit_block">
			<table>
				<tr>
					<td class="account_title">旧密码：</td>
					<td>
						<input id="txt_oldpwd" class="tb_m" type="password" />
					</td>
				</tr>
				<tr>
					<td class="account_title">新密码：</td>
					<td>
						<input id="txt_newpwd" class="tb_m" type="password" /> 至8个字符，最多30个字符
					</td>
				</tr>
				<tr>
					<td class="account_title">确认密码：</td>
					<td>
						<input id="txt_confirmpwd" class="tb_m" type="password" />
					</td>
				</tr>
			</table>
			<div class="account_btn_wrapper">
				<input type="button" onclick="ChangePwd();" value="保存" style="margin-left: 0;" />
				<input type="button" onclick="passwordToggle();" value="取消" style="margin-left: 3px;" />
				<br />
				<span id="tip_password" class="text_red"></span>
			</div>
		</div>
	</div>

function ChangePwd() {
			var value = $("#txt_newpwd").val();
			if (value == '') {
				$.messager.alert('请输入密码');
				return;
			}
			if (value != $("#txt_confirmpwd").val()) {
				$.messager.alert('两次密码输入不一致');
				return;
			}
			var oldpwd = $("#txt_oldpwd").val();
			if (value == oldpwd) {
				$.messager.alert("新密码不能与旧密码相同");
				return;
			}
			$.messager.alert("修改操作中，请稍候...");

                    //密码加密
	            var encrypt = new JSEncrypt(); 
                    encrypt.setPublicKey('')
		    var encrypted_input1 = encrypt.encrypt(oldpwd);
		    var encrypted_input2 = encrypt.encrypt(value);

                       //存入密码
			var ajax_data = {
			    oldpwd: encrypted_input1,
			    newpwd: encrypted_input2
			};

			$.ajax({
				url: '/user/ChangPwd',
				data: JSON.stringify(ajax_data),
				type: 'post',
				dataType: 'text',
				contentType: 'application/json; charset=utf8',
				cache: false,
				success: function (data) {
					if (data.indexOf('修改成功') > -1) {
						$.messager.alert(data + '，立即<a href="###" onclick="logout_immediate();return false;">重新登录</a>');
					}
					else
						$("#tip_password").html(data);
				},
				error: function (xhr) {
					$("#tip_password").html(xhr.responseText);
				}
			});
		}