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检测一个变量是string类型220409.html

<!--
 * @Author: your name
 * @Date: 2022-04-09 15:05:23
 * @LastEditTime: 2022-04-09 15:09:14
 * @LastEditors: your name
 * @Description: 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
 * @FilePath: \geyao\geyao\检测一个变量是string类型220409.html
-->
<!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>检测变量是string类型</title>
</head>
<body>
  <script>
    //true
    var geyao="hello geyao"
    function stringBoolean(str){
      if(typeof str == "string"||str.constructor==String){
        return true
      }else{
        return false
      }
    }
  </script>
</body>
</html>