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<!DOCTYPE html> <html> <body> <p>切勿将布尔值创建为对象。</p> <p>不能安全地比较布尔值和对象。</p> <p id="demo"></p> <script> var x = false; // x is a boolean var y = new Boolean(false); // y is an object document.getElementById("demo").innerHTML = typeof x + "<br>" + typeof y; </script> </body> </html>