index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script>
/*
名词捕获 传统
*/
let str = '2018-03-20';
let red = /(\d{4})-(\d{2})-(\d{2})/;
let dataArr = str.match(red);
let year = dataArr[1];
let month = dataArr[2];
let day = dataArr[3];
console.log(year, month, day); // 2018 03 20
/*
名词捕获 Es2018(Es9)新增
*/
let newred = /(?<years>\d{4})-(?<months>\d{2})-(?<days>\d{2})/;
console.log(str.match(newred));
let {years,months,days} = str.match(newred).groups;
console.log(years, months, days); // 2018 03 20
/*
反向引用命名捕获
*/
let reg2 = /^(?<Strive>welcome)-\k<Strive>-\1$/;
let a = 'a-a';
let b = 'Strive-Strive';
let c = 'welcome-welcome';
let d = 'welcome-welcome-welcome';
console.log(reg2.test(a)); // false
console.log(reg2.test(b)); // false
console.log(reg2.test(c)); // false
console.log(reg2.test(d)); // true
// 标签函数
function fn(args){
console.log(args); // 返回一个数组，第0项是'welcome'
return args[0].toUpperCase();
};
/*
这样调用是普通函数
fn();
*/
// 这样调用为 标签函数
console.log(fn`welcome`); // WELCOME
</script>
</body>
</html>
