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白衣少年 发布的文章
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Mybaits中的大于小于等于 前言在mybatis中写sql语句时，我们偶尔会需要比较数据，这时就需要用到< 、>、<=、>=等的这类符号。这类符号在mybaits中的表现方式和在mysql语法中的表现方式是有点不同的。错误截图，IDEA中报错内容如下：他提示我语法部分的<=,这里估计是将我的<识别成了xml中的左括号了所以我们可以用特殊替代符号替换他，如下截图：正文话不多说，如下：两种方式：第一种sql语法原符号 mybaits替换符号 <（小于） <（小于） <=（小于等于） <=（小于等于） >（大于） >（大于） >=（大于等于） >=（大于等于） &（且） &（且） '（单引号） '（单引号） "（双引号） "（双引号）第二种大于等于 <![CDATA[ >= ]]> 小于等于 <![CDATA[ <= ]]>举例a >= ba >= b 或者 a <![CDATA[ >= ]]> ba < ba < b本篇文章参考：https://blog.csdn.net/teavamc/article/details/88854857https://blog.csdn.net/weixin_42555133/article/details/90172797 -
Java Vue 前后端跨域解决方案 Java Vue 前后端跨域解决方案项目是后端SpringBoot整合MyBatis 前端Vue+axios事情起因，因为公司目前有些东西很每天录数据很麻烦，所以打算自己给公司写一个库存管理的项目，可是在写好接口后，前端封装完axios后请求接口时出现了岔子，居然 跨域 了！！！！😭错误截图 :$(youling)解决方案【后端】给Java代码添加过滤器，使其能够跨域请求，代码如下import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.cors.CorsConfiguration; import org.springframework.web.cors.UrlBasedCorsConfigurationSource; import org.springframework.web.filter.CorsFilter; @Configuration public class CorsConfig { private CorsConfiguration Buildconfig() { // 创建一个CorsConfiguration对象 CorsConfiguration corsConfiguration = new CorsConfiguration(); // 允许所有域模式 corsConfiguration.addAllowedOriginPattern("*"); // 暴露所有头部 corsConfiguration.addExposedHeader("*"); // 允许凭据 corsConfiguration.setAllowCredentials(true); // 允许所有方法 corsConfiguration.addAllowedMethod("*"); return corsConfiguration; } @Bean public CorsFilter corsFilter(){ UrlBasedCorsConfigurationSource source=new UrlBasedCorsConfigurationSource(); // 注册CorsConfiguration配置到source中 source.registerCorsConfiguration("/**", Buildconfig()); return new CorsFilter(source); } }效果请求成功！！！完美解决！！！ :$(ku)文章末尾【分享下我的axios封装】import axios from "axios"; // const Api_URL='http://localhost:3000' const Api_URL = 'http://localhost:8080' // 请求头设置 // axios.defaults.headers.common['User-Agent'] = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36'; const instance = axios.create({ Api_URL, timeout: 6000, withCredentials:true, changeOrigin: true, // headers: {'X-Custom-Header': 'foobar'} 设置请求头就会跨域报错！！！所以注销了 }); //axios 超时时间 axios.defaults.timeout = 10000; axios.defaults.withCredentials=true; // 请求拦截器 instance.interceptors.request.use((config) => { // if (localStorage._token) { // config.headers.Authorization = localStorage._token; // } return config; },function (error) { return Promise.reject(error) }); //响应拦截器 instance.interceptors.response.use( (res) => { return res; }, (error) => { // 错误状态码处理 if (error.response) { let {status} = error.response switch (status) { case 404: message.error(error.response.message) break case 500: message.error(error.response.statusText) break } } return Promise.reject(error); } ); const http = { /** get 请求 * @param {接口地址} url * @param {请求配置} config */ async get(url, config) { return new Promise((resolve, reject) => { instance .get(Api_URL + url, {params: config}) .then((response) => { if (response) resolve(response.data); }) .catch((error) => { reject(error); }); }); }, /** post 请求 * @param {接口地址} url * @param {请求数据} data * @param {配置} config */ async post(url, data, config) { return new Promise((resolve, reject) => { instance .post(Api_URL + url, data, config) .then((response) => { console.log(response); if (response) resolve(response.data); }) .catch((error) => { reject(error); }); }); }, /** delete 请求 * @param {接口地址} url * @param {请求配置} config */ async delete(url, config) { return new Promise((resolve, reject) => { instance .delete(Api_URL + url, { data: config, }) .then((response) => { if (response) resolve(response.data); }) .catch((error) => { reject(error); }); }); }, /** put 请求 * @param {接口地址} url * @param {请求配置} config */ async put(url, config) { return new Promise((resolve, reject) => { instance .put(Api_URL + url, config) .then((response) => { if (response) resolve(response.data); }) .catch((error) => { reject(error); }); }); }, }; export default http;
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HTML - 圆环时钟 一款好看的时间时钟html代码，加在网站侧边栏也是非常好看，强力推荐！！<html> <head> <style> * { border: 0; box-sizing: border-box; margin: 0; padding: 0; } :root { --hue: 223; --bg: hsl(var(--hue), 10%, 90%); --fg: hsl(var(--hue), 10%, 10%); font-size: calc(16px + (24 - 16) * (100vw - 320px) / (1280 - 320)); } body, button { color: #fff; font: 1em/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; } body { background-color: #1F1F1F; height: 100vh; display: grid; place-items: center; } .progress-clock { display: grid; justify-content: center; align-content: center; position: relative; text-align: center; width: 16em; height: 16em; } .progress-clock__time-date, .progress-clock__time-digit, .progress-clock__time-colon, .progress-clock__time-ampm { transition: color 0.2s linear; -webkit-user-select: none; -moz-user-select: none; user-select: none; } .progress-clock__time-date, .progress-clock__time-digit { background: transparent; } .progress-clock__time-date, .progress-clock__time-ampm { grid-column: 1 / 6; } .progress-clock__time-date { font-size: 0.75em; line-height: 1.33; } .progress-clock__time-digit, .progress-clock__time-colon { font-size: 2em; font-weight: 400; grid-row: 2; } .progress-clock__time-colon { line-height: 1.275; } .progress-clock__time-ampm { cursor: default; grid-row: 3; } .progress-clock__rings { display: block; position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; } .progress-clock__ring { opacity: 0.1; } .progress-clock__ring-fill { transition: opacity 0s 0.3s linear, stroke-dashoffset 0.3s ease-in-out; } .progress-clock__ring-fill--360 { opacity: 0; stroke-dashoffset: 0; transition-duration: 0.3s; } [data-group]:focus { outline: transparent; } [data-units] { transition: opacity 0.2s linear; } [data-group="d"]:focus, [data-group="d"]:hover { color: hsl(333, 90%, 55%); } [data-group="h"]:focus, [data-group="h"]:hover { color: hsl(33, 90%, 55%); } [data-group="m"]:focus, [data-group="m"]:hover { color: hsl(213, 90%, 55%); } [data-group="s"]:focus, [data-group="s"]:hover { color: hsl(273, 90%, 55%); } [data-group]:focus~.progress-clock__rings [data-units], [data-group]:hover~.progress-clock__rings [data-units] { opacity: 0.2; } [data-group="d"]:focus~.progress-clock__rings [data-units="d"], [data-group="d"]:hover~.progress-clock__rings [data-units="d"], [data-group="h"]:focus~.progress-clock__rings [data-units="h"], [data-group="h"]:hover~.progress-clock__rings [data-units="h"], [data-group="m"]:focus~.progress-clock__rings [data-units="m"], [data-group="m"]:hover~.progress-clock__rings [data-units="m"], [data-group="s"]:focus~.progress-clock__rings [data-units="s"], [data-group="s"]:hover~.progress-clock__rings [data-units="s"] { opacity: 1; } /* Dark theme */ @media (prefers-color-scheme: dark) { :root { --bg: hsl(var(--hue), 10%, 10%); --fg: hsl(var(--hue), 10%, 90%); } .progress-clock__ring { opacity: 0.2; } } </style> </head> <body> <div id="clock" class="progress-clock"> <button class="progress-clock__time-date" data-group="d" type="button"> <small data-unit="w">Sunday</small><br> <span data-unit="mo">January</span> <span data-unit="d">1</span> </button> <button class="progress-clock__time-digit" data-unit="h" data-group="h" type="button">12</button><span class="progress-clock__time-colon">:</span><button class="progress-clock__time-digit" data-unit="m" data-group="m" type="button">00</button><span class="progress-clock__time-colon">:</span><button class="progress-clock__time-digit" data-unit="s" data-group="s" type="button">00</button> <span class="progress-clock__time-ampm" data-unit="ap">AM</span> <svg class="progress-clock__rings" width="256" height="256" viewBox="0 0 256 256"> <defs> <linearGradient id="pc-red" x1="1" y1="0.5" x2="0" y2="0.5"> <stop offset="0%" stop-color="hsl(343,90%,55%)" /> <stop offset="100%" stop-color="hsl(323,90%,55%)" /> </linearGradient> <linearGradient id="pc-yellow" x1="1" y1="0.5" x2="0" y2="0.5"> <stop offset="0%" stop-color="hsl(43,90%,55%)" /> <stop offset="100%" stop-color="hsl(23,90%,55%)" /> </linearGradient> <linearGradient id="pc-blue" x1="1" y1="0.5" x2="0" y2="0.5"> <stop offset="0%" stop-color="hsl(223,90%,55%)" /> <stop offset="100%" stop-color="hsl(203,90%,55%)" /> </linearGradient> <linearGradient id="pc-purple" x1="1" y1="0.5" x2="0" y2="0.5"> <stop offset="0%" stop-color="hsl(283,90%,55%)" /> <stop offset="100%" stop-color="hsl(263,90%,55%)" /> </linearGradient> </defs> <!-- Days of Month --> <g data-units="d"> <circle class="progress-clock__ring" cx="128" cy="128" r="74" fill="none" opacity="0.1" stroke="url(#pc-red)" stroke-width="12" /> <circle class="progress-clock__ring-fill" data-ring="mo" cx="128" cy="128" r="74" fill="none" stroke="url(#pc-red)" stroke-width="12" stroke-dasharray="465 465" stroke-dashoffset="465" stroke-linecap="round" transform="rotate(-90,128,128)" /> </g> <!-- Hours of Day --> <g data-units="h"> <circle class="progress-clock__ring" cx="128" cy="128" r="90" fill="none" opacity="0.1" stroke="url(#pc-yellow)" stroke-width="12" /> <circle class="progress-clock__ring-fill" data-ring="d" cx="128" cy="128" r="90" fill="none" stroke="url(#pc-yellow)" stroke-width="12" stroke-dasharray="565.5 565.5" stroke-dashoffset="565.5" stroke-linecap="round" transform="rotate(-90,128,128)" /> </g> <!-- Minutes of Hour --> <g data-units="m"> <circle class="progress-clock__ring" cx="128" cy="128" r="106" fill="none" opacity="0.1" stroke="url(#pc-blue)" stroke-width="12" /> <circle class="progress-clock__ring-fill" data-ring="h" cx="128" cy="128" r="106" fill="none" stroke="url(#pc-blue)" stroke-width="12" stroke-dasharray="666 666" stroke-dashoffset="666" stroke-linecap="round" transform="rotate(-90,128,128)" /> </g> <!-- Seconds of Minute --> <g data-units="s"> <circle class="progress-clock__ring" cx="128" cy="128" r="122" fill="none" opacity="0.1" stroke="url(#pc-purple)" stroke-width="12" /> <circle class="progress-clock__ring-fill" data-ring="m" cx="128" cy="128" r="122" fill="none" stroke="url(#pc-purple)" stroke-width="12" stroke-dasharray="766.5 766.5" stroke-dashoffset="766.5" stroke-linecap="round" transform="rotate(-90,128,128)" /> </g> </svg> </div> </body> <script> window.addEventListener("DOMContentLoaded", () => { const clock = new ProgressClock("#clock"); }); class ProgressClock { constructor(qs) { this.el = document.querySelector(qs); this.time = 0; this.updateTimeout = null; this.ringTimeouts = []; this.update(); } getDayOfWeek(day) { switch (day) { case 1: return "Monday"; case 2: return "Tuesday"; case 3: return "Wednesday"; case 4: return "Thursday"; case 5: return "Friday"; case 6: return "Saturday"; default: return "Sunday"; } } getMonthInfo(mo, yr) { switch (mo) { case 1: return { name: "February", days: yr % 4 === 0 ? 29 : 28 }; case 2: return { name: "March", days: 31 }; case 3: return { name: "April", days: 30 }; case 4: return { name: "May", days: 31 }; case 5: return { name: "June", days: 30 }; case 6: return { name: "July", days: 31 }; case 7: return { name: "August", days: 31 }; case 8: return { name: "September", days: 30 }; case 9: return { name: "October", days: 31 }; case 10: return { name: "November", days: 30 }; case 11: return { name: "December", days: 31 }; default: return { name: "January", days: 31 }; } } update() { this.time = new Date(); if (this.el) { // date and time const dayOfWeek = this.time.getDay(); const year = this.time.getFullYear(); const month = this.time.getMonth(); const day = this.time.getDate(); const hr = this.time.getHours(); const min = this.time.getMinutes(); const sec = this.time.getSeconds(); const dayOfWeekName = this.getDayOfWeek(dayOfWeek); const monthInfo = this.getMonthInfo(month, year); const m_progress = sec / 60; const h_progress = (min + m_progress) / 60; const d_progress = (hr + h_progress) / 24; const mo_progress = ((day - 1) + d_progress) / monthInfo.days; const units = [{ label: "w", value: dayOfWeekName }, { label: "mo", value: monthInfo.name, progress: mo_progress }, { label: "d", value: day, progress: d_progress }, { label: "h", value: hr > 12 ? hr - 12 : hr, progress: h_progress }, { label: "m", value: min < 10 ? "0" + min : min, progress: m_progress }, { label: "s", value: sec < 10 ? "0" + sec : sec }, { label: "ap", value: hr > 12 ? "PM" : "AM" } ]; // flush out the timeouts this.ringTimeouts.forEach(t => { clearTimeout(t); }); this.ringTimeouts = []; // update the display units.forEach(u => { // rings const ring = this.el.querySelector(`[data-ring="${u.label}"]`); if (ring) { const strokeDashArray = ring.getAttribute("stroke-dasharray"); const fill360 = "progress-clock__ring-fill--360"; if (strokeDashArray) { // calculate the stroke const circumference = +strokeDashArray.split(" ")[0]; const strokeDashOffsetPct = 1 - u.progress; ring.setAttribute( "stroke-dashoffset", strokeDashOffsetPct * circumference ); // add the fade-out transition, then remove it if (strokeDashOffsetPct === 1) { ring.classList.add(fill360); this.ringTimeouts.push( setTimeout(() => { ring.classList.remove(fill360); }, 600) ); } } } // digits const unit = this.el.querySelector(`[data-unit="${u.label}"]`); if (unit) unit.innerText = u.value; }); } clearTimeout(this.updateTimeout); this.updateTimeout = setTimeout(this.update.bind(this), 1e3); } } </script> </html>
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VueRouter - 前端路由管理器 VueRouter - 前端路由管理器Vue Router是Vue.js官方的路由管理器，它可以帮助开发者构建单页应用程序（SPA）。Vue Router提供了一组API，可以让开发者轻松地管理应用程序的路由。Vue Router的优点包括：简单易用：Vue Router的API非常简单，因此开发者可以很快上手。灵活性：Vue Router可以与Vue.js无缝集成，因此开发者可以根据自己的需求选择最合适的工具。功能强大：Vue Router提供了一组强大的功能，包括路由嵌套、路由参数、路由导航守卫等。社区支持：Vue Router拥有一个庞大的社区，因此开发者可以轻松地找到解决问题的方法。下面是一个简单的Vue Router案例：<!DOCTYPE html> <html> <head> <title>Vue Router Demo</title> <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script> <script src="https://unpkg.com/vue-router/dist/vue-router.js"></script> </head> <body> <div id="app"> <router-link to="/">Home</router-link> <router-link to="/about">About</router-link> <router-view></router-view> </div> <script> // 定义组件 var Home = { template: '<div>Home</div>' } var About = { template: '<div>About</div>' } // 定义路由 var routes = [ { path: '/', component: Home }, { path: '/about', component: About } ] // 创建路由实例 var router = new VueRouter({ routes: routes }) // 创建Vue实例 var app = new Vue({ router: router }).$mount('#app') </script> </body> </html>在这个案例中，我们定义了两个组件：Home和About。然后定义了两个路由：'/'和'/about'，分别对应Home和About组件。最后创建了一个Vue实例，并将路由实例作为参数传递给Vue实例。在HTML中，我们使用<router-link>标签来创建路由链接，使用<router-view>标签来渲染组件。总的来说，Vue Router是一个非常优秀的前端路由管理器，它可以帮助开发者构建单页应用程序。如果您正在寻找一个简单、灵活和易于上手的前端路由管理器，那么Vue Router绝对值得一试。
