xxxxxxxxxx<html><head><meta charset="utf-8"><title>W3Cschool教程(w3cschool.cn)</title></head><body><p>判断是否为日期。</p><p id="demo"></p><script>var myDate = new Date();document.getElementById("demo").innerHTML = isDate(myDate);function isDate(myDate) { return myDate.constructor.toString().indexOf("Date") > -1;}</script></body></html>