1. Date.now()
//Date.now() is in ECMAScript 5 //Prior to that, use +new Date() //获取当前时间 var now = (typeof Date.now == "function" ? Date.now() : +new Date()); alert("Right now: " + now);
2. Date.parse() method
var now = new Date(); alert(now); var someDate = new Date(Date.parse("May 25, 2004")); //parse() 方法可解析一个日期时间字符串,并返回 1970/1/1 午夜距离该日期时间的毫秒数。 alert(someDate);
3. Date UTC() and toUTCString() methods
//UTC() 方法可根据世界时返回 1970 年 1 月 1 日 到指定日期的毫秒数。 //Date.UTC(year,month,day,hours,minutes,seconds,ms) /* year 必需。表示年份的四位数字。 month 必需。表示月份的整数,介于 0 ~ 11。 day 必需。表示日期的整数,介于 1 ~ 31。 hours 可选。表示小时的整数,介于 0 ~ 23。 minutes 可选。表示分钟的整数,介于 0 ~ 59。 seconds 可选。表示秒的整数,介于 0 ~ 59。 ms 可选。表示毫秒的整数,介于 0 ~ 999。 Date.UTC() 是一种静态方法,因为需要使用构造函数 Date() 来调用它,而不是通过某个 Date 对象调用。 Date.UTC() 方法的参数指定日期和时间,它们都是 UTC 时间,处于 GMT 时区。指定的 UTC 时间将转换成毫秒的形式, 这样构造函数 Date() 和方法 Date.setTime() 就可以使用它了。 */ //toUTCString() 方法可根据世界时 (UTC) 把 Date 对象转换为字符串,并返回结果。 //January 1, 2000 at midnight var y2k = new Date(Date.UTC(2000, 0)); alert(y2k.toUTCString()); //May 5, 2005 at 5:55:55 PM GMT var allFives = new Date(Date.UTC(2005, 4, 5, 17, 55, 55)); alert(allFives.toUTCString());
The above is today’s summary of JavaScript learning, and it will continue to be updated every day. I hope you will continue to pay attention.

JavaScript core data types are consistent in browsers and Node.js, but are handled differently from the extra types. 1) The global object is window in the browser and global in Node.js. 2) Node.js' unique Buffer object, used to process binary data. 3) There are also differences in performance and time processing, and the code needs to be adjusted according to the environment.

JavaScriptusestwotypesofcomments:single-line(//)andmulti-line(//).1)Use//forquicknotesorsingle-lineexplanations.2)Use//forlongerexplanationsorcommentingoutblocksofcode.Commentsshouldexplainthe'why',notthe'what',andbeplacedabovetherelevantcodeforclari

The main difference between Python and JavaScript is the type system and application scenarios. 1. Python uses dynamic types, suitable for scientific computing and data analysis. 2. JavaScript adopts weak types and is widely used in front-end and full-stack development. The two have their own advantages in asynchronous programming and performance optimization, and should be decided according to project requirements when choosing.

Whether to choose Python or JavaScript depends on the project type: 1) Choose Python for data science and automation tasks; 2) Choose JavaScript for front-end and full-stack development. Python is favored for its powerful library in data processing and automation, while JavaScript is indispensable for its advantages in web interaction and full-stack development.

Python and JavaScript each have their own advantages, and the choice depends on project needs and personal preferences. 1. Python is easy to learn, with concise syntax, suitable for data science and back-end development, but has a slow execution speed. 2. JavaScript is everywhere in front-end development and has strong asynchronous programming capabilities. Node.js makes it suitable for full-stack development, but the syntax may be complex and error-prone.

JavaScriptisnotbuiltonCorC ;it'saninterpretedlanguagethatrunsonenginesoftenwritteninC .1)JavaScriptwasdesignedasalightweight,interpretedlanguageforwebbrowsers.2)EnginesevolvedfromsimpleinterpreterstoJITcompilers,typicallyinC ,improvingperformance.

JavaScript can be used for front-end and back-end development. The front-end enhances the user experience through DOM operations, and the back-end handles server tasks through Node.js. 1. Front-end example: Change the content of the web page text. 2. Backend example: Create a Node.js server.

Choosing Python or JavaScript should be based on career development, learning curve and ecosystem: 1) Career development: Python is suitable for data science and back-end development, while JavaScript is suitable for front-end and full-stack development. 2) Learning curve: Python syntax is concise and suitable for beginners; JavaScript syntax is flexible. 3) Ecosystem: Python has rich scientific computing libraries, and JavaScript has a powerful front-end framework.


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