feat: 🎸 新增 1月13日 早报

docs/2021/01/13.md

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+### 2021.01.13 今天是每日时报陪伴您的第 487 天
+
+[工具] 一个矫正 JavaScript 的计算工具 vue-chemistry：<https://github.com/antfu/vue-chemistry>
+
+```js
+import { set } from "vue-chemistry";
+import { sum } from "vue-chemistry/math";
+import { log } from "vue-chemistry/console";
+
+const a = ref(1);
+const b = ref(2);
+
+let c = sum(a, b); // c = a + b = 3
+
+set(a, 2); // shorthand for a.value = 2
+
+log(c); // it's 4 (2 + 2)!
+```
+
+[工具] vscode 插件测试工具：<https://github.com/microsoft/vscode-test>
+
+[文章] 快过年了，用 JS 让你的网页放 🎆 烟花吧：<https://juejin.cn/post/6916930617166807054>
+
+![](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/d148b2769738478cbc9f28660abc2a9c~tplv-k3u1fbpfcp-watermark.image)