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<!DOCTYPE html> <html> <body> <p>typeof 运算符返回变量、对象、函数或表达式的类型。</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = typeof "John" + "<br>" + typeof 3.14 + "<br>" + typeof NaN + "<br>" + typeof false + "<br>" + typeof [1, 2, 3, 4] + "<br>" + typeof {name:'John', age:34} + "<br>" + typeof new Date() + "<br>" + typeof function () {} + "<br>" + typeof myCar + "<br>" + typeof null; </script> </body> </html>