有效沟通问答-【官方】百战程序员_IT在线教育培训机构

           <!-- 家电部分 -->
            <div class="elc">
                <div class="elc-nav">
                    <a href="#">
                        <img src="../images/41d16e66381cfeda7b6b39ab67678d5e.jpg" alt="">  
                    </a>
                </div>     
                <h2 class="title">家电
                    <a href="#">
                        <span>热门</span>
                        <span>电视影音</span>
                    </a>
                </h2>
                <div class="elc-box">
                    <div class="items-2">
                        <a href="#">
                            <img src="../images/116fc43816b87192be4e67cf762e8da5.jpeg" alt="">
                         </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/03a9e7e96a09d256ca1badeec186c859.jpg" alt=""  class="img1">
                                <h3 class="name2">小米全面屏电视65英寸 E65X </h3>
                                <p class="desc2">全面屏设计</p>
                                <p class="price2">2999元<del class="original">3299元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/20d36fbaa18625e4fe507af31e4e9f83.jpg" alt="" class="img1">
                            <h3 class="name2">全面屏电视E43K  </h3>
                            <p class="desc2">全面屏设计，海量内容</p>
                            <p class="price2">1349元<del class="original">1500元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/9d8674cd21c486feff5328772ab9cf01.jpg" alt="" class="img1">
                            <h3 class="name2">小小米电视4A 70英寸 </h3>
                            <p class="desc2">大屏更享受</p>
                            <p class="price2">3599元<del class="original">3900元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/6bed167fc905bab57dee478bcf1e5e0d.JPG" alt="" class="img1">
                            <h3 class="name2">米家互联网对开门冰箱 540L </h3>
                            <p class="desc2">重磅新品福利特惠</p>
                            <p class="price2">2999元<del class="original">3600元</del></p>
                        </a>
                    </div>
                    <div class="items-2">
                        <a href="#">
                            <img src="../images/dfbdabe36b2d630d57a015e6fb5eb3ea.jpg" alt="">
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/b8c63a2024528fe5410ebe669b7d2407.jpg" alt="" class="img1">
                            <h3 class="name2">Redmi全自动波轮洗衣机1A 8kg</h3>
                            <p class="desc2">一键操作，父母都爱用</p>
                            <p class="price2">849元<del class="original">899元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/74e573c4c0d89048392d14831cc507d5.jpg" alt="" class="img1">
                            <h3 class="name2">Air 13.3" 2019款 </h3>
                            <p class="desc2">新一代独立显卡</p>
                            <p class="price2">6299元</p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/7e5f89adf98ab3fccb34012b5209cd58.jpg" alt="" class="img1">
                            <h3 class="name2">米家互联网烟灶套装（天然气）</h3>
                            <p class="desc2">点火排烟，风随火动</p>
                            <p class="price2">2298元</p>
                        </a>
                    </div>
                    <div class="items-last">
                        <div>
                            <a href="#">
                                <img src="../images/1612c93ad4756215774a0dbec7a81bb2.jpg" alt="">
                                <h3 class="name2">米家电烤箱 </h3>
                                <p class="price2">279元</p>
                            </a>
                        </div>
                        <div>
                            <a href="#">
                                <div class="more">浏览更多
                                    <small>电视影音</small>
                                </div>
                                <i class="icontfont">&#xe619;</i>
                            </a>
                        </div>
                    </div>
                </div>
            </div>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>小米广告部分</title>
    <link rel="icon" href="../images/favicon.ico">
    <link rel="stylesheet" href="../css/reset.css">
    <!-- <link rel="stylesheet" href="../css/demo.css "> -->
    <link rel="stylesheet" href="小米.css">
</head>
<body>
 <div class="content">
        <div class="wrap">
           <!-- 家电部分 -->
            <div class="elc">
                <div class="elc-nav">
                    <a href="#">
                        <img src="../images/41d16e66381cfeda7b6b39ab67678d5e.jpg" alt="">  
                    </a>
                </div>     
                <h2 class="title">家电
                    <a href="#">
                        <span>热门</span>
                        <span>电视影音</span>
                    </a>
                </h2>
                <div class="elc-box">
                    <div class="items-2">
                        <a href="#">
                            <img src="../images/116fc43816b87192be4e67cf762e8da5.jpeg" alt="">
                         </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/03a9e7e96a09d256ca1badeec186c859.jpg" alt=""  class="img1">
                                <h3 class="name2">小米全面屏电视65英寸 E65X </h3>
                                <p class="desc2">全面屏设计</p>
                                <p class="price2">2999元<del class="original">3299元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/20d36fbaa18625e4fe507af31e4e9f83.jpg" alt="" class="img1">
                            <h3 class="name2">全面屏电视E43K  </h3>
                            <p class="desc2">全面屏设计，海量内容</p>
                            <p class="price2">1349元<del class="original">1500元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/9d8674cd21c486feff5328772ab9cf01.jpg" alt="" class="img1">
                            <h3 class="name2">小小米电视4A 70英寸 </h3>
                            <p class="desc2">大屏更享受</p>
                            <p class="price2">3599元<del class="original">3900元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/6bed167fc905bab57dee478bcf1e5e0d.JPG" alt="" class="img1">
                            <h3 class="name2">米家互联网对开门冰箱 540L </h3>
                            <p class="desc2">重磅新品福利特惠</p>
                            <p class="price2">2999元<del class="original">3600元</del></p>
                        </a>
                    </div>
                    <div class="items-2">
                        <a href="#">
                            <img src="../images/dfbdabe36b2d630d57a015e6fb5eb3ea.jpg" alt="">
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/b8c63a2024528fe5410ebe669b7d2407.jpg" alt="" class="img1">
                            <h3 class="name2">Redmi全自动波轮洗衣机1A 8kg</h3>
                            <p class="desc2">一键操作，父母都爱用</p>
                            <p class="price2">849元<del class="original">899元</del></p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/74e573c4c0d89048392d14831cc507d5.jpg" alt="" class="img1">
                            <h3 class="name2">Air 13.3" 2019款 </h3>
                            <p class="desc2">新一代独立显卡</p>
                            <p class="price2">6299元</p>
                        </a>
                    </div>
                    <div class="items-1">
                        <a href="#">
                            <img src="../images/7e5f89adf98ab3fccb34012b5209cd58.jpg" alt="" class="img1">
                            <h3 class="name2">米家互联网烟灶套装（天然气）</h3>
                            <p class="desc2">点火排烟，风随火动</p>
                            <p class="price2">2298元</p>
                        </a>
                    </div>
                    <div class="items-last">
                        <div>
                            <a href="#">
                                <img src="../images/1612c93ad4756215774a0dbec7a81bb2.jpg" alt="">
                                <h3 class="name2">米家电烤箱 </h3>
                                <p class="price2">279元</p>
                            </a>
                        </div>
                        <div>
                            <a href="#">
                                <div class="more">浏览更多
                                    <small>电视影音</small>
                                </div>
                                <i class="icontfont">&#xe619;</i>
                            </a>
                        </div>
                    </div>
                </div>
            </div>
         </div>
    </div>

WEB前端全系列/第一阶段：HTML5+CSS3模块/CSS3新特性 22426楼

public String nameValidate(){
    return null
}

这个方法里不用加参数吗？

可以这样写吗：

public String nameValidate(String name){
    this.name=name;
    return null;
}

JAVA 全系列/第二阶段：JAVA 基础深化和提高/智能电话本项目实战 22427楼

我的输入用户与密码都不能登陆

webdemo2.zip

JAVA 全系列/第五阶段：JavaWeb开发/Web实战案例 22428楼

(A+lamda*I)x里面的I是什么意思呢？

人工智能/第四阶段：人工智能基础-高等数学知识强化/线性代数高级 22429楼

使用@ControllerAdvice与@ExceptionHandler注解创建全局异常处理类处理异常，将更新用户的return "redirect:/ok" 改成 return "reidrect:/ok"（把redirect改成拼错的单词），用户更新后页面为什么会跳到error页面，而不是全局异常处理器里跳转的error2页面？？我试了空指针异常和算数异常是会跳到error1和error2页面的

    @RequestMapping("/updateUsers")
    public String updateUser(Users users){

        this.usersService.modifyUser(users);
        return "redirect:/ok";

全局异常处理器

package com.bjsxt.springbootmybatis.exception;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.servlet.ModelAndView;

/**
 * 全局异常处理器
 */
@ControllerAdvice
public class GlobalException {
    /**
     * 处理空指针异常
     */
    @ExceptionHandler(value = {java.lang.NullPointerException.class})
    public ModelAndView nullPointExceptionHandler(Exception e){
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("err",e.toString());
        modelAndView.setViewName("error1");
        return modelAndView;
    }

    @ExceptionHandler(value = {java.lang.Exception.class})
    public ModelAndView ExceptionHandler(Exception e){
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("err",e.toString());
        modelAndView.setViewName("error2");
        return modelAndView;

    }

}

JAVA 全系列/第九阶段：Spring Boot实战/Spring Boot 22430楼

import matplotlib.pyplot as plt
np.random.seed(42)
x1 = np.random.rand(100, 1)
x2 = np.random.rand(100, 1)
# x0=np.ones(100,1)  在Linear Regression已经设置了截距
x_b = np.c_[x1, x2]

y = 5 * x1 + 4 * x2 + 2 + np.random.rand(100, 1)
reg = LinearRegression(fit_intercept=True)

reg.fit(x_b, y)

ic(reg.intercept_, reg.coef_)

# 计算预测值
x_new1 = np.array([[0, 0], [1 ,1] ])

ic(reg.predict(x_new1))
# draw plot
plt.plot(x_b,y,"r.")
plt.plot(x_new1,reg.predict(x_new1),"b")
plt.show()

当改变预测值的输入x_new,则红线变化很大，怎么分析它是否回归，为什么出现两条？

Python 全系列/第十九阶段：数据分析-统计分析/Python统计分析 22431楼

老师，为什么我的报的是这个错。

GetRequestServlet HttpServlet {
    (HttpServletRequest reqHttpServletResponse resp) ServletExceptionIOException {
         String username=req.getParameter()PrintWriter out=resp.getWriter()out.println()out.println()out.println()out.println()out.println(+username+)out.println()out.println()out.flush()out.close()}
}

demoServletcom.bjsxt.servlet.DemoServletdemoServlet/demo.dogetRequestServletcom.bjsxt.servlet.DemoServletgetRequestServlet/getInfo.do

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="getInfo.do" method="post">
        用户:<input type="text" name="username"/></br>
            <input type="submit" value="ok">
</form>
</body>
</html>

JAVA 全系列/第五阶段：JavaWeb开发/Servlet技术详解（旧） 22432楼

ego-shop.rar

老师这里为啥没显示文件状态呀

WEB前端全系列/第二十阶段：Vue2企业级项目（旧）/Ego商城高级Vue实战项目 22433楼

 ./configure \--prefix=/usr/localinx \--pid-path=ar/runinxinx.pid \--lock-path=ar/lockinx.lock \--error-log-path=ar/loginx/error.log \--http-log-path=ar/loginx/access.log \--with-http_gzip_static_module \--http-client-body-temp-path=ar/tempinx/client \--http-proxy-temp-path=ar/tempinx/proxy \--http-fastcgi-temp-path=ar/tempinx/fastcgi \--http-uwsgi-temp-path=ar/tempinx/uwsgi \--http-scgi-temp-path=ar/tempinx/scgi \--add-module=/usr/local/tmp/fastdfs-nginx-modulec

看到的复制这个吧 \(这中间不能有空格)--

JAVA 全系列/第十八阶段：亿级高并发电商项目_架构/编码（旧）/电商：基于FastDFS+Nginx+Kinkeditor实现商品新增 22434楼

老师，我之前的功能都是好好的，写了全局方法挂载后就出现问题了。

使用全局方法挂载后，状态都是无数据的。

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