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JavaScript typeof 运算符
tryjs_instanceof_set
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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> const fruits = new Set(["apples", "bananas", "oranges"]); document.getElementById("demo").innerHTML = "Set: " + (fruits instanceof Set); </script> </body> </html>