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Mark Davis Microsoft Corporation Summary: This article describes the significant performance impact of some of the DHTML features and provides some tips for improving the performance of DHTML pages. Directory Brief introduction Batch processing of DHTML changes Using innertext To add a single element using the DOM Extending options in a SELECT element Updating tables with the DOM Write once, use multiple times Do not use dynamic properties too much Data binding is effective Do not set the

DHTML page performance improvement Abstract: This article describes the significant impact of some DHTML functions on the performance, and provides some tips to improve DHTML page performance. Directory Introduction Batch Process DHTML changes Use innerText Use DOM to add a single element Extend the options in the SELECT Element Update a table with DOM Write Once, use multiple times Do not use dynamic attributes too much Data Binding is very effective Do not set the

' }); $.data (obj) //Object {name1: "Aaron1", Name2: "Aaron1"} Attaching data to DOM ElementWe use the simplest code to illustrate the process of this process:1. Get the node bodyvar $body = $ ("Body")2. Add a piece of data to the body, the property is Foo, and the value is 52$body. Data ("foo", 52);3. Remove Foo$body. Data (' foo ')Consider a problem:An element can normally be removed by using the. Remove () method, and the respective data is purged. However, for local objects, this

references through the garbage collector (GC), but some unknown factors may prevent the release of resources from the environment. For ie, the status of some DOM object instances is unknown to the script. The following are their basic principles: Figure 1: Basic cyclic Reference Model The leakage caused by this model is based on the reference count of COM. The script engine object maintains reference to the DOM object and waits for all references to be removed before the DOM object point

Abstract: This article describes the significant impact of some DHTML functions on the performance, and provides some tips to improve the performance of DHTML pages. Directory IntroductionBatch Process DHTML changesUse innerTextUse DOM to add a single elementExtend the options in the SELECT ElementUpdate a table with DOMWrite Once, use multiple timesDo not use dynamic attributes too muchData Binding is very effectiveDo not set the expando attribute i

corresponding number in the cache pool, and do the operation. General ideas to finish, then to analyze the specific ideas: In jquery, there is a data constructor that generates an instance whenever the constructor is run. jquery automatically generates two data instances by default: var datapriv = new Data () jquery Private, we try not to operate on this instance. var datauser = new data () This is the service to the user, we use the Data () method is to operate on this instance. All data

cannot accept the data cache, which are marked in the NoData object. Dom types that cannot accept the data cache as long as the DOM object node name and the corresponding attribute conform to the noData set rule are: ' var match = jquery.nodata[elem.nodeName.toLowerCase ()]; ', The corresponding Acceptdata () method returns FALSE. for DOM objects that accept data caching, the data for each object is cached in the global cache object Jquery.cache, not in the DOM object itself! This is the key p

values. This is especially true for positional attributes. 　　　 　　 Tip 8: Restrict the use of dynamic properties. 　 　　　 Data binding is effective 　　　 Data binding (English) is a powerful feature that enables you to bind the results of a database query or the contents of an XML data island to HTML elements on a Web page. Instead of returning to the server to extract data, you can provide data sorting and filtering capabilities, as well as different views of the data. Imagine a Web page

following JScript behaviors are triggered:· All variables must be declared.· The function becomes a constant.· Internal objects cannot have the expando attribute.· Internal object attributes cannot be listed or changed.· The arguments object is unavailable.· You cannot assign values to read-only variables, fields, or methods.· The eval method cannot define identifiers within a closed range.· The eval method executes scripts in a restricted security c

Abstract: This article describes the significant impact of some DHTML functions on the performance, and provides some tips to improve the performance of DHTML pages.DirectoryIntroductionBatch Process DHTML changesUse innerTextUse DOM to add a single elementExtend the options in the SELECT ElementUpdate a table with DOMWrite Once, use multiple timesDo not use dynamic attributes too muchData Binding is very effectiveDo not set the expando attribute in t

type of code that is allowed, programs can be more efficient and execute faster. However, some of the features available in previous versions are not available in quick mode. Most of these features are incompatible with multi-threaded applications and make generationCode inefficiencies. For programs compiled with the command-line compiler, you can turn off quick mode and take advantage of full backward compatibility. Note that code compiled in this way runs slower and is less fault tolerant. Fa

Mode In quick mode, the following JScript behavior is triggered: · All variables must be declared. · The function becomes a constant. · Internal objects cannot have expando properties. · You cannot list or change the properties of an internal object. · The arguments object is not available. · You cannot assign a value to a read-only variable, field, or method. · The Eval method cannot define identifiers within the enclosing scope. · The Eva

(NodeList,function(Val, i) { -That[i] =Val; the }) - This. selector =sel; - This. length =nodelist.length; - } + } - } + AJQuery.prototype.init.prototype =Jquery.prototype; at -window.$ =JQuery; - - - functionData () { - This. UID = 1; in //it turned out to be a tamper-proof object (Simplified) - This. cache = {}; to This. exp