<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <script src="jquery-3.3.1.min.js"></script> </head> <script type="text/javascript"> var beforeLoad = (new Date()).getTime();//返回距 1970 年 1 月 1 日之间的毫秒数: function getPageLoadTime(){ var afterLoad = (new Date()).getTime(); var seconds = (afterLoad-beforeLoad)/1000;//1000ms=1s $("#loadtime").text(seconds + '秒'); console.log(afterLoad,beforeLoad); } window.onload = getPageLoadTime; </script> <body> <div id="loadtime"></div> <div id="chosed"></div> <button onclick="start()" accesskey="s">开始(<u>S</u>)</button> <button onclick="stop()" accesskey="o">结束(<u>O</u>)</button> <div id="age_limit"> <select name="year" id="year"> <option value="1999">1999</option> <option value="2000">2000</option> <option value="2001">2001</option> <option value="2002">2002</option> <option value="2003">2003</option> <option value="2004">2004</option> </select> <select name="month" id="month"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> <option value="6">6</option> <option value="7">7</option> <option value="8">8</option> <option value="9">9</option> <option value="10">10</option> <option value="11">11</option> <option value="12">12</option> </select> <button id="check">检测</button> </div> <form action="" id="form1"> <input type="text"> <textarea name="" id="" cols="30" rows="10"></textarea> <input type="checkbox" checked name="ss" id=""> <select name="ss" id=""> <option value="2">2</option> <option value="2x">2x</option> </select> <input type="button" value="clear" onclick="clearForm($('form1'))"> </form> </body> <script> //jQuery模拟抽奖程序 var members = "甲乙丙丁戊己庚辛壬"; var membersArr = members.split(""); var num = membersArr.length - 1; var timer; function getRamdom(min,max){ return parseInt(Math.random()*(max-min+1));//如随机数生成0.5,数组长度为13(14个数据),得到的整型数为6 } function change(){ $("#chosed").html(membersArr[getRamdom(0,num)]);//将显示div里的内容替换为选中的 } function start(){ clearInterval(timer);//防止多次点击出现问题 timer = setInterval('change()',100); }; function stop(){ clearInterval(timer); } console.log(membersArr); //年龄的计算(用原生js写) var checkBtn = document.getElementById("check"); checkBtn.onclick = function(){ var currentDate = new Date(); var birthDate = new Date(); var year = document.querySelector("#year").value; var month = document.querySelector("#month").value; var requiredAge = 18; birthDate.setFullYear(year,month-1);//获取正确格式的出生日期 currentDate.setFullYear(currentDate.getFullYear()-requiredAge)//得到至少要求的日期 //很刺激,因为不用考虑月份的计算了... console.log(birthDate,year,month,currentDate); if(currentDate - birthDate < 0){ alert("年龄不满足要求噢"); return false; } return true; } //一个通用的、能够清除所有表单内容的函数 function clearForm(form){ $(':input',form).each(function(){//循环所有input控件 var type = this.type; var tag = this.tagName.toLowerCase(); if(type == 'text' || type == "password" || tag == "textarea"){ this.value = ""; }else if(type == "checkbox" || type == "radio"){ this.checked = false; }else if(tag == 'select'){ this.selectedIndex = -1;//表示不选中任何元素· } }) }; </script> </html>