Is the variable in JavaScript a value or a pass? _javascript Tips

The headline is a bit clumsy, but it's the key to understanding the data structure. The 4 terms in the title, corresponding in English are: shallow copy (note, not shadow copy), deep copy, pass by value, pass by reference (or pass by address). It's

JavaScript-specific method computing the number of 1 in binary split method _javascript technique

The code is as follows: Copy Code code as follows: function g (n) { var n = n.tostring (2); var count = 0; for (Var i=0;i{ if (n[i] = = "1") count++; } return count; } Think this write is very troublesome,

JavaScript in IE and Firefox (Firefox) Incompatible problem solving method Summary _javascript Tips

1. There is no outerHTML method in Outerhtml,ff compatible with Firefox. Copy Code code as follows: if (window. HtmlElement) { htmlelement.prototype.__definesetter__ ("outerHTML", function (SHTML) { var r=this.ownerdocument.createrange

JavaScript URL encoding and decoding using instructions _javascript tips

When you use GB2312 on some delivery pages and use UTF8 on the receiving page, the parameters you receive may be inconsistent with what you originally received. URLs encoded using the server-side UrlEncode function are not the same as URLs encoded

JavaScript deep understanding of JS closure _javascript skills

scope of a variable To understand closures, you must first understand JavaScript's special variable scope. The scope of a variable is nothing more than two kinds: global and local variables. The special point of the JavaScript language is that

JavaScript Development Specification requirements (illustrated) _javascript skills

I have in the development work and not according to the norms of the development of colleagues to cooperate with him can not use the "happy" to describe the. Now I write the purpose of this article in addition to share a little experience with you,

Javascript New keyword mystery and other _javascript techniques

Take a look at one of the old pros that is not fresh but interesting to the rookie:      What the heck is that? It's a Luan Lun. New With the above diagram, let's look at the second question left in the previous article, where we can add

JavaScript Client solution cache provider _javascript Tips

Believe that every developer knows the importance of caching. There is a cached background (Memcached,xcache, etc.) from beginning to end. ) to reduce the pressure on db. In the Content distribution network (CDN) cache, you want your browser to

Sleep-enabled JavaScript-self-compiling JS engine _javascript Tips

That is why the function is so needed, but why does JS not provide such a function? At present browsers are in the UI thread parsing JS, for example, Firefox browser, I recompile the JS engine, and in the JS alarm added to the sleep method, the

JavaScript setattribute, GetAttribute different performance _javascript techniques on different browsers

Test environment (client browser) IE6,IE7, IE8 compatibility mode, IE8 Firefox 3.6.8, Google Chrome 5.0.375.125 The standard definitions of two functions are described first. Elementnode.setattribute (Name,value) Name required. Specify the name of

Memory leak _javascript techniques caused by JavaScript removechild

To verify, I wrote a page to validate how memory leaks. The code is as follows Copy Code code as follows: Test Memory leaks Create Elements [BR] Delete Elements [BR] Test div is still there

JavaScript uses eval or new function for grammar checking _javascript techniques

Use the new Function () for syntax checking The eval () method is not available for random use, and using the eval () method when it is not appropriate may cause the entire program to be problematic; and the new Function () is not that big a problem.

How to remove duplicate values from an array in JavaScript _javascript tips

Copy Code code as follows: Topic: Write a function that removes duplicate values from the given array. Such as: Incoming array A = [0, 8, 5, 4, M, 8, N, 4, ' A ', ' B ', ' a ']; Request return: [0,4,5,8,78,90,a,b] For this

JavaScript removes repeating elements from an array _javascript tips

In the process of writing a program, you often encounter the need to remove duplicate elements from an array. It is not difficult to implement this function. We can do this with a double loop, and for small arrays, that's certainly not the case. But

JavaScript string string optimization problem _javascript Tips

Copy Code code as follows: test The result is not like the general saying, use array will be quick. In ie9,8. Ff,google, Sogou and other IE core browser under the test, indeed in the order of magnitude more than 100000 of

Questions about JavaScript modularity and namespace management _javascript tips

"About modularity and why to Modularize" Let's talk about why we want to modularize. In fact, this is related to coding ideas and the convenience of code management (no mention of namespace pollution is because I believe that the coder who has

JavaScript template engine-tmpl bug fixes and performance optimization analysis _javascript tips

Subtle Tmpl. The front-end template class is open source, but most of the "JavaScript Micro Templating" developed by the JQuery author John Resig is the most sophisticated, with a few strokes to achieve the core functionality of the template engine.

JavaScript functions, creating objects, encapsulation, properties and methods, inheriting _javascript tips

One, function From the beginning of contact with JS feel good flexible, everyone's writing is different, such as a function on the N-type such as: function ShowMsg () {},var showmsg=function () {},showmsg=function () {} There seems to be no

JavaScript Authority Guide Learning notes JavaScript data types _javascript Tips

Copy Code code as follows: javascript Data Type

The sequence of _javascript of JavaScript operands

Like what Copy Code code as follows: A * b + C; , calculate the powers first, calculate the multiplication and division, and then add and subtract , with parentheses, first of all parentheses, the same level of operation in

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