JavaScript

CopyCode The Code is as follows: function fors (){ Obj_a = obj_ B; Obj_ B .attr = obj_a; } Copy codeThe Code is as follows: function fors (){Obj_ B = {};Obj_ B .attr = obj_ B;} The above are two explicit circular references. Memory leakage occurs

1. Check NaN In mathematics, any value x is always equal to itself: X = x However, this rule does not apply to ===and NaN:Copy codeThe Code is as follows:> NaN = NaNFalse The result is that you cannot find this NaN in an array containing NaN by

1. statements and expressions Expressions in JavaScript are different from statements. an expression generates a value, which can be placed wherever a value is needed, for example, as a function call parameter. each line of code below is an

Copy codeCode: var EventUtil = {// cross-browser handler --- Creation Method AddHandler: function (element, type, handler ){ If (element. addEventListener ){ Element. addEventListneter (type, handler, false ); } Else if (element. attachEvent

1. Non-logical The logic is not used! It can apply any type of value with ECMAScript. A boolean value (true/false) is returned for a logical non-operation ). This operator first converts its operands to a Boolean value and then reverse it. The

Let's first look at a piece of traditional inheritance code: Copy codeThe Code is as follows: // defines the superclass Function Father (){ This. name = "father "; } Father. prototype. theSuperValue = ["NO1", "NO2"]; // Define subclass Function

Now, let's get down to the truth. I found a lot of ways to restrict text boxes on the Internet, so I had to practice it on my own and practice it. That's right. Copy codeThe Code is as follows: function chkPrice (obj ){ Obj. value = obj. value.

This section uses the following html as an example. Copy codeThe Code is as follows: Baidu 1. Obtain and set the element features through the attributes of the HTMLElement type (object)Copy codeThe Code is as follows: var div = document.

Package. js Project address: http://code.google.com/p/package-js/ Package. js is a convenient JavaScript Package dependency management and Make tool. It is designed to make JavaScript Component/App development on the browser more modular. If you

Javascript: ObjectObjects we have briefly introduced before. They are a type of object that aggregates multiple data values in one unit and uses names for access. They are a disordered set of attributes. 1. Several ways to create objects Copy

1. Meaning of path symbolsSrc = "/js/jquery. js", "../" is the absolute path, indicating the website root directory. Others such ". /",".. /"," jquery. js "," js/jquery. js "and so on indicate the paths relative to the current web page and relative

Copy codeThe Code is as follows: var date1 = new Date (dateTimes [z] [1]); In Firefox, the time can be obtained normally, but in IE7 it is NaN. After a long time, I gave up the new date, and then found the segment code in a foreigner's Forum to be

The requirements are as follows: Can start, pause (linear, non-linear tween support), continue, end Supports parallel processing of multiple styles It is better to run without relying on a framework The smaller the file size, the better. He looked

Introduction From the beginning of this chapter, I will continue to (translate, repost, and organize) http://dmitrysoshnikov.com/the website is about the excellent documents of the ecmascriptstandard. This chapter describes the execution context in

Preface In this chapter, we will explain part 1 of The Five Principles of S.O.L. I. D: Implementation of The JavaScript language, and The Principle of Open and Closed OCP (The Open/Closed Principle ). The opening/closing principle is described as

We will use the constructor mode to rewrite the factory mode. Copy codeThe Code is as follows: function Employee (name, age, job ){ This. name = name; This. age = age; This. job = job; This. sayName = function (){ Alert (this. name ); }; } Var Jim =

Introduction: Today, I saw a question from someone else: Copy codeThe Code is as follows: function fn (x ){ X = 10; Arguments [0] = 20; Console. log (x, arguments [0]) } Fn () I feel like I have no idea about this. I can try it myself, so I will

Copy codeThe Code is as follows: // Html structure to string format display support line feed Function ToHtmlString (htmlStr ){ Return toTXT (htmlStr). replace (/\ & lt \; br [\ & ensp \; |\& emsp \;] * [\/]? \ & Gt \; | \ r \ n | \ n/g, " "); }

For example: New Boolean (false) An object will be returned. This object has a valueOf method that will return the encapsulated value. This is completely unnecessary and sometimes confusing. Do not use new Boolean, new Number, or new String. In

I. Judgment Syntax Prop in objectName If the object pointed to by objectName contains the property or key value of prop, The in operator returns true. Copy codeThe Code is as follows: var arr = ['one', 'two', 'three ', 'four']; Arr. five = '5 '; 0