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<!DOCTYPE html> <html> <body> <h2>JavaScript Date 日期对象</h2> <p>这个“自制”的 isDate() 函数在用于日期时返回 true：</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>