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                目錄 (づ ̄ 3 ̄)づ=> [TOC] ## toString ``` /** * toString * 能讓二進制8進制16進制之間相互轉換 */ console.log(0b10111000.toString(16)); //b8 console.log(0x123.toString(2)); //100100011 console.log(0123.toString(2)); //1010011 ``` >[danger] - 字符串形式的數字不能進行進制轉換,會原樣輸出 > - console.log((10).toString(2)) 10進制轉為其它時必須包一個括號 ## parseInt ``` /** * 能將任意進制轉換為10進制,第二個參數表示要解析的進制是多少進制,默認為10 */ //使用了0b 0x 這種表示進制的前綴會自動匹配對應進制 console.log(parseInt(0123)); console.log(parseInt(0x123)); //會自動匹配對應進制 //在不使用0b 0x這種進制前綴時,可以手動在第二個參數選擇使用哪種進制解析 console.log(parseInt(100,2)); //4 //但最終解析成的都是十進制表示的數 ``` ## 進制之間可直接比較 ``` 0xff > 0b00000001 ? console.log(true):console.log(false); ``` ## string_decoder解決亂碼問題 ``` /** * string_decoder * .write方法 */ //解決亂碼 let s = require('string_decoder'); let s = new StringDecoder(); console.log(sd.write(buf10)); //write的時候會判斷是不是一個字符,如果是的話就輸出,不是的話則緩存在對象內部,等下次write的時候會把前面緩存的字符加到第二次write時 ``` ## 如何將一個unicode碼轉換成utf8 ``` /** * 1.如何把一個unicode碼轉成utf8編碼 * 傳進去一個unicode碼,返回一個utf8編碼 萬 4E07 * Unicode符號范圍 | UTF-8編碼方式 (十六進制) | (二進制) ----------------------+--------------------------------------------- 0000 0000-0000 007F | 0xxxxxxx 0000 0080-0000 07FF | 110xxxxx 10xxxxxx 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx **/ function transfer(number) { const a = parseInt('7f'); const b = parseInt('07ff'); const c = parseInt('8000000ffff'); const d = parseInt('100000010ffff'); const v = parseInt(number); let bit = v.toString(2); if(v<=a){ return bit.toString(16); }else if(v>a&&v<=b){ let arr = ["110", "10"]; arr[1] += bit.substring(bit.length-6); arr[0] += bit.substring(0,bit.length-6).padStart(5,'0'); return arr.map(item=>parseInt(item,2).toString(16)); } else if(v>b&&v<=c){ let arr = ["1110", "10", "10"]; arr[2] += bit.substring(bit.length-6); arr[1] += bit.substring(bit.length-12,bit.length-6); arr[0] += bit.substring(0,bit.length-12).padStart(4,'0'); return arr.map(item=>parseInt(item,2).toString(16)); }else if(v>c&&v<=d){ let arr = ["11110","1110", "10", "10"]; arr[3] += bit.substring(bit.length-6); arr[2] += bit.substring(bit.length-12,bit.length-6); arr[1] += bit.substring(bit.length-18,bit.length-12); arr[0] += bit.substring(0,bit.length-12).padStart(3,'0'); return arr.map(item=>parseInt(item,2).toString(16)); }else{ return new Error('您輸入的數字超過了范圍'); } } ``` ## BOM ![](https://box.kancloud.cn/8c00369f5ad484ef004b3083421bcd4d_504x270.png)
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