今天我参加了一次代码评审,结果领导看到了我本地代码的控制台,被我花里胡哨的console 打印
内容给吸引住了!竟然还说我这东西有意思,花里胡哨的他可喜欢了!可是接着他又问我,这么花里胡哨的东西,上生产会不会影响性能啊?我自信满满地回答说:不会的,代码内有判断,只有在开发环境下才会打印出来!老板听后非常满意,于是要求我给其他前端同事们分享一下,说说具体实现思路!老板这么抬举,咱岂能放过装杯机会,哈哈。最后,这个方法还被加入公司的公用 utils 库里,供大家使用呢!
先来看一下效果:
但是,我们无法控制表格的宽度,因此,这个方法不太好用,不如原生。
仅在开发环境使用
// 美化打印实现方法 const prettyLog = () => { //判断是否生产环境 const isProduction = import.meta.env.MODE === 'production'; const isEmpty = (value: any) => { return value == null || value === undefined || value === ''; }; const prettyPrint = (title: string, text: string, color: string) => { if (isProduction) return; // ... }; // ... const picture = (url: string, scale = 1) => { if (isProduction) return; // ... }; // retu; return { info, error, warning, success, picture, table }; };
我们可以通过import.meta.env.MODE
判断当前环境是否为生产环境,在生产环境,我们可以禁用信息打印!
完整代码
// 美化打印实现方法 const prettyLog = () => { const isProduction = import.meta.env.MODE === 'production'; const isEmpty = (value: any) => { return value == null || value === undefined || value === ''; }; const prettyPrint = (title: string, text: string, color: string) => { if (isProduction) return; console.log( `%c ${title} %c ${text} %c`, `background:${color};border:1px solid ${color}; padding: 1px; border-radius: 2px 0 0 2px; color: #fff;`, `border:1px solid ${color}; padding: 1px; border-radius: 0 2px 2px 0; color: ${color};`, 'background:transparent' ); }; const info = (textOrTitle: string, content = '') => { const title = isEmpty(content) ? 'Info' : textOrTitle; const text = isEmpty(content) ? textOrTitle : content; prettyPrint(title, text, '#909399'); }; const error = (textOrTitle: string, content = '') => { const title = isEmpty(content) ? 'Error' : textOrTitle; const text = isEmpty(content) ? textOrTitle : content; prettyPrint(title, text, '#F56C6C'); }; const warning = (textOrTitle: string, content = '') => { const title = isEmpty(content) ? 'Warning' : textOrTitle; const text = isEmpty(content) ? textOrTitle : content; prettyPrint(title, text, '#E6A23C'); }; const success = (textOrTitle: string, content = '') => { const title = isEmpty(content) ? 'Success ' : textOrTitle; const text = isEmpty(content) ? textOrTitle : content; prettyPrint(title, text, '#67C23A'); }; const table = () => { const data = [ { id: 1, name: 'Alice', age: 25 }, { id: 2, name: 'Bob', age: 30 }, { id: 3, name: 'Charlie', age: 35 } ]; console.log( '%c id%c name%c age', 'color: white; background-color: black; padding: 2px 10px;', 'color: white; background-color: black; padding: 2px 10px;', 'color: white; background-color: black; padding: 2px 10px;' ); data.forEach((row: any) => { console.log( `%c ${row.id} %c ${row.name} %c ${row.age} `, 'color: black; background-color: lightgray; padding: 2px 10px;', 'color: black; background-color: lightgray; padding: 2px 10px;', 'color: black; background-color: lightgray; padding: 2px 10px;' ); }); }; const picture = (url: string, scale = 1) => { if (isProduction) return; const img = new Image(); img.crossOrigin = 'anonymous'; img.onload = () => { const c = document.createElement('canvas'); const ctx = c.getContext('2d'); if (ctx) { c.width = img.width; c.height = img.height; ctx.fillStyle = 'red'; ctx.fillRect(0, 0, c.width, c.height); ctx.drawImage(img, 0, 0); const dataUri = c.toDataURL('image/png'); console.log( `%c sup?`, `font-size: 1px; padding: ${Math.floor((img.height * scale) / 2)}px ${Math.floor((img.width * scale) / 2)}px; background-image: url(${dataUri}); background-repeat: no-repeat; background-size: ${img.width * scale}px ${img.height * scale}px; color: transparent; ` ); } }; img.src = url; }; // retu; return { info, error, warning, success, picture, table }; }; // 创建打印对象 const log = prettyLog();
至此,前端花式 console 打印就完成了,喜欢的拿去不谢,更多请关注其它相关文章!