mocha js tutorial

JS BasicsGrammar' Use strict ' (strict mode)Defining variablesvar object; Declare unassigned only, default value is undefined;var object1= value; Declare and assign value;function Fun (a) {This is also called a local variablevar obj=[] This is called a local variable and cannot be called in the outer body of the functionObjct1=[] is called a global variable, which can be used when the function name is called once.}Multi-variable definitionvar a,b,cx=1

The JS keyboard control event tutorial obtains keyboard control events, which is one of the most interactive methods. The first thing you need to know is how to initialize the event. The basic statement is as follows: document. onkeydown = keydown when the browser reads this statement, it calls the keydown () function no matter which key is pressed on the keyboard. Capturing Keyboard Events is a little diff

As we all know, jQuery is now very popular, and jQuery has already been used on Baidu's new homepage. Today we will summarize how to write better jQuery code to make jQuery Code better and faster to execute, I hope this jQuery tutorial will change your previous unreasonable practices. 1. Correctly reference jQuery1. Try to introduce jQuery before the body ends, rather than in the head.2. Use a third-party CDN to introduce jQuery. Note that when a pro

JavaScript: js Code note (judge the length of textbox and fix the maximum number of characters), Javascript tutorial Untitled Document

I. Methods of UseThe HTML structure of the canvas plugin is very simple, which is to use a tag:You can then invoke the plug-in using the following method:function init () {document.getElementById (' Portrait-image '). Closepixelate ([{resolution:24},{shape: ' Circle ', resolution:24, Size:16, Offset:12, alpha:0.5}]);};Window.addeventlistener (' Load ', init, false);Second, the structure function and the methodvar Img=document.getelementbyid (' portrait-img ');var mypixelation=new closepixelatio

Original addressWe learned about the creation of maps and markers in the front. So today we're going to learn how to display a window on a map (Infowindow)The Infowindow constructor is:Infowindow (opts?:infowindowoptions). The infowindowoptions Object Specifies the initialization parameters that are used to display the information window. Infowindowoptions Object Properties:content: contains a text string or displays a DOM node in the Information window. Pixeloffset: represents the position offs

Transferred from: http://blog.csdn.net/lulei9876/article/details/8494337When self-study jquery, saw an English word (Callback), immediately back faint cold sweat. Google quickly found that the original Chinese translation into a callback. That is, the callback function. Do not understand Ah, so in the Google callback function, found that the online Chinese interpretation is too "abstruse", I admit that I caishuxueqian. After looking at some examples of callbacks, it seems a bit understandable. H

(‘false‘); // true! ‘false‘字符串转换结果为true！因为它是非空字符串！var b3 = Boolean(‘‘); // falsevar s = String(123.45); // ‘123.45‘typeof s; // ‘string‘Did you feel a big head? This is the hypnotic charm peculiar to JavaScript!To summarize, there are a few rules to follow: Do not new Number() use new Boolean() , new String() create packaging objects; Use parseInt() or parseFloat() to convert any type to number ; The String() method used to convert any type to string , or directly invoke, an obj

pixel px) */@ media (min-width: pixel px ){. text h2 {font-size: 26px ;}. text p {font-size: 18px ;}. tab2-text {float: left ;}. tab2-img {float: right ;}} JS control vertical center $('.text').eq(0).css('margin-top', ($('.auto').eq(0).height() - $('.text').eq(0).height()) / 2 + 'px');$(window).resize(function() { $('.text').eq(0).css('margin-top', ($('.auto').eq(0).height() - $('.text').eq(0).height()) / 2 + 'px');});$('.text').eq(1).css('margin-

1. Uppercase,lowercase Case Conversion{{' lower cap string '|}} //Result: LOWER CAP STRING{{"TANK is good"|}} //Result: Tank is good 2. Date format{{1490161945000| date:"Yyyy-mm-dd HH:mm:ss"}}//2017-03-22 13:52:25 3, number formatting (keep decimals){{149016.1945000| number:2}} 4. Currency Currency format{{]|}} //Result: $250.00{{] | currency:"Rmb￥"}}//Result: rmb￥250.00 5. Filter LookupInput filters can be added to the directive with a pipe character (|) and a filter followed by a

is an object, then the properties inside the object are allowed to be modified.. cannot be duplicate with other identifiers1 Const user = ' GHOSTWU '; 2 console.log (user); 3 user = ' Zhangsan '; Error, cannot be re-assigned value1 const user; Error, no initial value given at the time of definition Constuser={name : ' GHOSTWU ' }; console.log (user.name);//ghostwu user.name= ' Zhangsan '; properties of //objects allowed to be modified console.log (user.name); //zhangsan Const USER = {name: ' G

Uniform motion: Refers to the movement of an object in a straight line, and the displacement of an object through any equal time interval is equal. In fact, it is uniform motion, it is characterized by an acceleration of 0, from the definition, in any equal time interval, the speed and direction are the same.1238 - to + -The above example lets a small ball with a radius of 20px from x=0, y=canvas the height of half, at 2px per frame speed to the right uniform motion.We can encapsulate the ball i

SMS Verification Code countdown can be very good to avoid frequent user access, usually using the JS implementation to obtain SMS Verification code countdown function, the specific implementation of the following:HTML section:Page effect:JS section:Final implementation effectReproduced in this article: http://www.lx598.com/hangyedongtai/1028.htmlJS implementation to send SMS Verification Code Countdown tutorial