instaceof只可以用来判断数组和对象,不能判断string和boolean类型 下面为封装方法进行改进 varo ={'name':'lee'};vara = ['reg','blue'];vargetDataType =function(o){if(oinstanceofArray){return'Array'}elseif( oinstanceofObject ){return'Object'; }else{return'param is no object type'; } }; ...
To use jsdom, you will primarily use the JSDOM constructor, which is a named export of the jsdom main module. Pass the constructor a string. You will get back a JSDOM object, which has a number of useful properties, notably window: const dom = new JSDOM(`<!DOCTYPE html><p>Hello ...
console.log(checkBoolean(null)); //false console.log(checkBoolean(undefined)); //false console.log(checkBoolean(NaN)); //false console.log(checkBoolean(a));//true console.log(checkBoolean(c));//true javascript中有六种数据类型:string;boolean;Array;Object;null;undefined。如何检测这些数据类型呢...
Learn Vue by Building and Deploying a CRUD App - This course is focused on teaching the fundamentals of Vue by building and testing a web application using Test-Driven Development (TDD). Advanced Vue.js Features from the Ground Up - Learn how to build more accessible routing, state management...
Sencha Ext JS is the most comprehensive JavaScript framework for building data-intensive, cross-platform web and mobile applications for any modern device.
2014-04-07 17:22 −js判断是否是数字 第一种方法 isNaN isNaN 返回一个 Boolean 值,指明提供的值是否是保留值 NaN (不是数字)。 NaN 即 Not a Number isNaN(numValue) 但是如果numValue果是一个空串或是一个空格,而isNaN是做为数字0进行处理... ...
Type:string If provided, and the element does not already have anid, this value is used as theidof the player element. inactivityTimeout Type:number Video.js indicates that the user is interacting with the player by way of the"vjs-user-active"and"vjs-user-inactive"classes and the"useract...
简介:JS:JS中常见的 “函数名 is not a function” 错误 s中常见的错误,例如Uncaught TypeError: x is not a function 其原因除了函数本身有错之外,还有一种很奇怪的情况:函数本身没有错,但是运行时就是不能正常运行。这种情况与javascript的特性有关:变量与函数声明前置的优先级。
...js_Current.zip js_Current js"> js"> <...部分 $(document).ready(function(){ if(String(window.location).indexOf("php")判断是否是首页.文件后缀 $(".nav 16.6K20 js对象判断方法 // 判断对象的方法 let obj6 = { a: 1, b: 2 }; // 1. typeof console.log(typeof obj6 === "...
Bootstrap 5 is evolving with each release to better utilize CSS variables for global theme styles, individual components, and even utilities. We provide dozens of variables for colors, font styles, and more at a :root level for use anywhere. On components and utilities, CSS variables are scope...