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<!DOCTYPE html> <html> <body> <p>如果指定对象是指定对象的实例，则 instanceof 运算符返回 true。</p> <p id="demo"></p> <script> var cars = ["Saab", "Volvo", "BMW"]; document.getElementById("demo").innerHTML = (cars instanceof Array) + "<br>" + (cars instanceof Object) + "<br>" + (cars instanceof String) + "<br>" + (cars instanceof Number); </script> </body> </html>