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<!DOCTYPE html> <html> <body> <h2>JavaScript typeof</h2> <p>typeof 运算符为对象、数组和 null 返回对象。</p> <p>typeof 运算符不会为函数返回对象。</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = typeof {name:'john', age:34} + "<br>" + typeof [1,2,3,4] + "<br>" + typeof null + "<br>" + typeof function myFunc(){}; </script> </body> </html>