console 命令行工具 X clear

console

// let regExp=/^[_a-zA-Z0-9]+\@[_a-zA-Z0-9]+\.[_a-zA-Z0-9]+$/
let c='777@qq.com'

let regExp=/\w+@([0-9a-zA-Z]+[-0-9a-zA-Z]*)(\.[0-9a-zA-Z]+[-0-9a-zA-Z]*)+/
console.log(regExp.test(c))

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <title>Document</title>
</head>
<body>
  
</body>
</html>