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javascript对象小结

时间：2021-07-01 10:21:17 帮助过：3人阅读

距离某天还有天
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>javascript对象</title> <script language="javascript" type="text/javascript"> var regExp=/\s\*/g; /*---------------string对象------------------*/ var str="this *is *test *string"; var sTxt=str.charAt(3); var aTxt=str.charCodeAt(3); var btxt=str.indexOf("s"); var cTxt=str.slice(0,4); var dTxt=str.split(" "); var subTxt=str.substr(0,4); var regTxt=str.match(regExp); var regSearchTxt=str.search(regExp); document.writeln("原始字符串："+str+" "); document.writeln("charAt(3),返回索引字符："+sTxt+" "); document.writeln("charCodeAt(3),返回unicode字符代码："+aTxt+" "); document.writeln("indexOf,返回指定字符索引"+btxt+" "); document.writeln("slice(0,4),返回0，4之间的字符:"+cTxt+" "); document.writeln("split(' '),以空格截取字符成数组："+dTxt+" "); document.writeln("substr(0,4),截取两个索引之间的字符："+subTxt+" "); document.writeln("match,返回匹配的字符串："+regTxt+" "); document.writeln("search,返回匹配的字符串的便宜位置："+regSearchTxt+" "); /*-----------------正则表达式---------------*/ //test var result_tst=regExp.test(str); document.writeln("regExp.test(str),返回是否匹配："+result_tst+" "); //exec var result_exec=regExp.exec(str); document.writeln("返回匹配的内容："+result_exec+" "); var result=str.replace(regExp,"_"); document.writeln("返回替换的内容："+result+" "); //匹配规则 var reg2=/:\s*\w*\s*[0-9]+\s[0-9]{4}/; var reg1=/:\D*\s*\d+\s\d+/; var reg3=/w*@w+.w/; var str2="this is a date: march 12 2010"; var eTxt=str2.match(reg2); document.writeln(eTxt+" "); //*----------------Date对象--------------------*/ var now=new Date(); var hours=now.getHours()+7*24; now.setHours(hours); document.write("一个星期后是："+now+" "); document.write("现在是"+now.getFullYear() +"年"+(now.getMonth()+1)+"月"+now.getDate() +"日"+now.getHours()+"时"+now.getMinutes() +"分"+now.getSeconds()+"秒"+" "); //计时器 function countTime(){ var targetTime = new Date(2010,6,24,12,0,0,0); var nowTime = new Date(); //距离目标时间 var distanTime=targetTime.getTime()-nowTime.getTime(); days = Math.floor( distanTime / 1000 / 60 / 60 / 24); hours = Math.floor(distanTime/ 1000 / 60 / 60 - (24 * days)); minutes = Math.floor( distanTime/1000/60-(24*60*days)-(60*hours)); seconds =distanTime/1000-(24*60*60*days)-(60*60*hours)-(60*minutes); secondsRound = Math.round(seconds); document.getElementById("days").innerHTML=""+days+""; document.getElementById("time").innerHTML=hours+":"+minutes+":"+secondsRound; } setInterval("countTime()",250); //数组 var firstArr=new Array("one","two","three"); var secondArr=["one","two","three"]; var remove=firstArr.slice(2,3); var splicArr=secondArr.splice(1,1); document.writeln(remove+" "); document.writeln(splicArr+" "); //队列 var fifoArr=new Array(); fifoArr.push("apple"); fifoArr.push("banana"); var length=fifoArr.push("cherry"); document.writeln("数组的长度是："+length+" 数组内容是："+fifoArr+" "); fifoArr.shift(); document.writeln("使用shift命令删除第一个元素："+fifoArr+" "); fifoArr.unshift("addFruite"); document.writeln("使用unshift命令增加第一个元素："+fifoArr+" "); fifoArr.pop(); document.writeln("使用pop命令最后一个元素："+fifoArr+" "); </script> </head> <body> 距离某天还有天 </body> </html>
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javascript对象小结

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