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<!DOCTYPE html> <html> <body> <h2>JavaScript</h2> <p>undefined 和 null 值相等但类型不同：</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = typeof undefined + "<br>" + typeof null + "<br><br>" + (null === undefined) + "<br>" + (null == undefined); </script> </body> </html>