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eval的使用220315.html

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>eval的使用</title>
</head>
<body>
  <script>
    //   eval() 函数会将传入的字符串当做 JavaScript 代码进行执行。
  var fangfang=eval(new String('2 + 2'))
  console.log(fangfang,"fangfang") //String { "2 + 2" }
  var fangfangTest=new String('2 + 2')
  console.log(fangfangTest,"fangfangTest") //String { "2 + 2" }
  var geyao=eval('2 + 2')
  console.log(geyao,"geyao") //4
  </script>
</body>
</html>