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JavaScript typeof 运算符
tryjs_typeof_undefined_4
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<!DOCTYPE html> <html> <body> <h1>JavaScript Operators</h1> <h2>The typeof Operator</h2> <p>The value and the data type of a variable that has not been assigned a value is undefined.</p> <p id="demo"></p> <script> let car; document.getElementById("demo").innerHTML = "<p>The value of car is " + car + "<p>The typeof car is " + typeof car; </script> </body> </html>