AI代码解释 constunitObj={beforeUnit:'before',afterUnit:'after',yearUnit:'year',monthUnit:'month',dateUnit:' days ',hourUnit:'hour',minutesUnit:'min',secondUnit:'sec'}constshowData=timeBox.getDistanceNow('1908-12-02 06:00:00',unitObj);// 溥仪登基啦console.log('溥仪登基详细时间===',...
JavaScript BigInt is a new datatype (ES2020) that can be used to store integer values that are too big to be represented by a normal JavaScript Number. Example letx = BigInt("123456789012345678901234567890"); Try it Yourself » You will learn more aboutBigIntlater in this tutorial. ...
6.isAfterDate:检查是否在某日期后 const isAfterDate = (dateA, dateB) => dateA > dateB; isAfterDate(new Date(2010, 10, 21), new Date(2010, 10, 20)); // true 7.isBeforeDate:检查是否在某日期前 const isBeforeDate = (dateA, dateB) => dateA < dateB; isBeforeDate(new Date(2010,...
javascript当中Date对象用法 htmlhttpjava 2.Date对象例 2.1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <Script> /*马克-to-win:Global有个Date()这个方法。*/ /*When the Global object is created, it always has at least t...
Date.setSeconds(sec,millisec) Parameters ParameterDescription secRequired. An integer representing the seconds Expected values are 0-59, but other values are allowed: -1 will result in the last second of the previous minute 60 will result in the first second of the next minute ...
// trueconsole.log(+0 == -0); // trueconsole.log(false == false); // trueconsole.log(Number.MAX_SAFE_INTEGER == Number.MAX_SAFE_INTEGER); // trueconsole.log(null == null); // trueconsole.log(undefined == undefined); ...
函数是 JavaScript 中的基本组件之一。JavaScript 中的函数类似于过程——一组执行任务或计算值的语句。但要成为函数,这个过程应该接受输入并返回与输入存在某些明显关系的输出。要使用一个函数,你必须将其定义在你希望调用它的作用域内。
javascript提供了几个特殊数值,包括Number.MAX_VALUE、Number.MIN_VALUE、Number.POSITIVE_INFINITY、Number.NEGATIVE_INFINITY、Number.MAX_SAFE_INTEGER、Number.MIN_SAFE_INTEGER、Number.NaN、+0、-0共9个 其中,前7个特殊数值是Number对象的属性 最值 前面已介绍过Number.MAX_VALUE代表javascript最大值,Number.MIN_...
int = ~~myVar, // to integer float = 1*myVar, // to float bool = !!myVar, /* to boolean - any string with length and any number except 0 are true */ array = [myVar]; // to array 转换日期(new Date(myVar))和正则表达式(new RegExp(myVar))必须使用构造函数,而且创建正则表达式的...
* Bitshifting the String to coerce it to a * Number made it a lot faster. */ var val = inputValue >> 0; Note: Be careful when using bitshift operations. Numbers are represented as 64-bit values, but Bitshift operations always return a 32-bit integer (source). Bitshift can lead to...