<html><body><h2>JavaScript 数字</h2><p>切勿将数字创建为对象。</p><p>无法安全地比较数字和对象。</p><p id="demo"></p><script>var x = 500; // x is a numbervar y = new Number(500); // y is an objectdocument.getElementById("demo").innerHTML = (x==y);</script></body></html>