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JavaScript typeof 运算符
tryjs_instanceof_date
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<!DOCTYPE html> <html> <body> <h1>JavaScript Operators</h1> <h2>The instanceof Operator</h2> <p>The instanceof operator returns true if an object is an instance of a specified object type:</p> <p id="demo"></p> <script> // Create a Date const time = new Date(); document.getElementById("demo").innerHTML = "Date: " + (time instanceof Date); </script> </body> </html>