Guotong Liao
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Guotong Liao
### 使用内置方法 ```js const x = 10 console.log(x.toString(2)) // "1010" ``` ### 手动实现 ```js let x = 10 let str = '' while (x) { str += x & 1...
```js const str = "ABCabc123" let res = 0 for (const c of str) if ((c >= 'a' && c = 'A' && c