<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script>
    
        console.log(Boolean('')); // false
        console.log(Boolean(0)); // false
        console.log(Boolean(NaN)); // false
        console.log(Boolean(null)); // false
        console.log(Boolean(undefined)); // false
        console.log(Boolean('123'));//ture                       
        console.log(Boolean('hello'));//ture 
        console.log(Boolean('我很好'));//ture       
    </script>
</head>

<body>

</body>

</html>

true代表真，false代表假，代表空、否定的值alse），其余全为真（true）

记住以上代码块中的5个假案例即可~