Date

<script> //1.Date對(duì)象var d1 = new Date(); //Thu May 02 2019 14:27:19 GMT+0800 (中國(guó)標(biāo)準(zhǔn)時(shí)間) console.log(d1); //轉(zhuǎn)成2019/5/2 下午2:27:19 console.log(d1.toLocaleString());//距離1900年經(jīng)過(guò)年數(shù)console.log(d1.getYear());//119 //獲取當(dāng)前紀(jì)年console.log(d1.getFullYear());//2019 //獲取一年中當(dāng)前月份console.log(d1.getMonth()); //4, 0-11//獲取一個(gè)月中的日期 console.log(d1.getDate());//時(shí) console.log(d1.getHours()); //分 console.log(d1.getMinutes()); //秒 console.log(d1.getSeconds());//設(shè)置月份時(shí)，記得值為0-11var d2 = new Date(2012,11,12,12,12,12);console.log(d2.toLocaleString());//2012/12/12 下午12:12:12//可以創(chuàng)建一個(gè)距離1970年經(jīng)過(guò)的毫秒數(shù)var d3 = new Date(1528980372222);console.log(d3.toLocaleString()) </script>

Math

<script >console.log(Math.random()) // [0,1) 隨機(jī)數(shù)console.log(Math.abs(-5)) //求取絕對(duì)值 console.log(Math.round(4.5)); //四舍五入 console.log(Math.ceil(3.1)); //天花板 console.log(Math.floor(3.9)); //地板 console.log(Math.pow(2,20)); //x的y次冪 console.log(Math.PI); //圓周率 </script>

String

<script type="application/javascript">//var str = new String("aabbcc");var str2 = "aabdcbc";//console.log(str); console.log(str2);//轉(zhuǎn)化大小寫(xiě)console.log(str2.toUpperCase()); //大寫(xiě)console.log(str2.toLowerCase()); //小寫(xiě)//返回指定索引處的字母console.log(str2.charAt(3));//返回指定字母首次出現(xiàn)的索引console.log(str2.indexOf("b"));//返回指定字母最后一次出現(xiàn)的索引console.log(str2.lastIndexOf("b"));//截取子字符串，從x位置截取y個(gè)字符console.log(str2.substr(2,3));//截取子字符串，從x位置截到y(tǒng)位置console.log(str2.substring(2,3));//字符串length屬性表示字符的個(gè)數(shù) console.log(str2.length)</script>

Object

<script type="application/javascript">//1.在js中，我們可以使用Object對(duì)象來(lái)表述一個(gè)人var obj = new Object();//2.在js中，對(duì)象有個(gè)特點(diǎn)：屬性可以動(dòng)態(tài)的添加//添加屬性obj.name = "laowang";//修改屬性的值obj.name = "laoma";//刪除屬性delete obj.name;function factory(name,age){var obj = new Object();obj.name = name;obj.age = age;return obj;}var per1 = factory("laowang",30);console.log(per1.name);var c1 = factory("benz",3);console.log(c1.name);//封裝的人“類(lèi)”function Person(name,age){this.name = name;this.age = age;}var p1 = new Person("zhangsan",20);console.log(p1.name);console.log(p1.age);var p2 = new Person("喬峰",25);console.log(p2.name);console.log(p2.age);p2.skill = "降龍十八掌";console.log(p1.skill);console.log(p2.skill);//為所有對(duì)象都添加屬性Person.prototype.money = 8888;Person.prototype.like = ["吃飯","睡覺(jué)","打豆豆"];Person.prototype.eat = function(){alert("吃飯了，好開(kāi)心！");}console.log(p1.money);console.log(p2.money);p1.like.push("寫(xiě)Java");console.log(p1.like);console.log(p2.like);p1.money = 88888;console.log(p1.money);console.log(p2.money);function Student(){this.sno = Math.random();}Student.prototype = new Person("lisi",8);var s1 = new Student();console.log(s1.name);console.log(s1.age);console.log(s1.sno);console.log(s1.money);console.log(s1.like)</script>

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轉(zhuǎn)載于:https://www.cnblogs.com/aknife/p/10805153.html

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