{ console.log('a',`\u0061`); //a,a console.log('s',`\u20BB7`); //s ₻7 console.log('s',`\u{20BB7}`) //s ? }//charCodeAt 和 codePointAt{ let s = 'a'; let a = '?'; console.log('length',s.length,a.length); //1,2 console.log('0',a.charAt(0)); //取字符 0 � console.log('1',a.charAt(1)); //取字符 1 � console.log('0',a.charCodeAt(0)); //取编码 0 55362 console.log('0',a.charCodeAt(1)); //取编码 0 57271
let s1 = '?a'; console.log('length',s1.length); //length 3 ?占俩字符 console.log('code0',s1.codePointAt(0)); //code0 134071 为十进制 console.log('code0',s1.codePointAt(0).toString(16)); //code0 20bb7 为十六进制 console.log('code1',s1.codePointAt(1)); //code1 57271 console.log('code2',s1.codePointAt(2)); //code2 97 其实就是a}//fromCharCode 和 fromCodePoint{ console.log(String.fromCharCode('0x20bb7')); //ஷ console.log(String.fromCodePoint('0x20bb7'));//?} //code 处理遍历编码{ let str = '\u{20bb7}abc'; for(let i=0;i<str.length;i ){ console.log('es5',str[i]); //� � a b c } for(let code of str){ console.log('es6',code); //? a b c }
}
//includes startsWith endsWith 包含，开始，结束某字符串{ let str = 'string'; console.log('include',str.includes('c')); //include false console.log('start',str.startsWith('str')); //start true console.log('end',str.endsWith('ng')); //start true}//复制{ let str = 'abc'; console.log(str.repeat(2)); //abcabc}//模板字符串{ let name = 'list'; let info = 'hell world'; let m = `i am ${name},${info}`; console.log(m); //i am list,hell world}//补白 padStart padEnd 1不够两位，给它补一个0.{ console.log('1'.padStart(2,'0')); //01 console.log('1'.padEnd(2,'0')); //10}//标签模板{ let user = { name:'list', info:'hello world' }; abc`i am ${user.name},${user.info}`; function abc(s,v1,v2){ console.log(s,v1,v2); // "i am ", ",", "" }}{ let user = { name:'list', info:'hello world' }; console.log('111',abc`i am ${user.name},${user.info}`); // 111 i am ,,,listhello world function abc(s,v1,v2){ console.log('222',s,v1,v2); // 222 "i am ", ",", "" return s v1 v2; }}
//raw 转义{ console.log(String.raw`Hi\n${1 2}`); // Hi\n3 console.log(`Hi\n${1 2}`); // Hi 3}
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