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JavaScript typeof运算符
tryjsref_oper_typeof2
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<!DOCTYPE html> <html> <body> <h1>JavaScript Operators</h1> <h2>The typeof Operator</h2> <p>The typeof operator returns the type of a variable, object, function or expression:</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = "The typeof 'John' is :" + typeof "John" + "<br>" + "The typeof 3.14 is :" + typeof 3.14; </script> </body> </html>