expando

) { document.write ("obj." + key + '. Name = ' + Obj[key].name); } Script> The results shown are: $.data (obj, ' name ') = value Obj.jQuery16018518865841457738.name = Value In this code, we first append an attribute to "obj" (named "Name", "value") and then get the appended data through $.data (obj, ' name '). In order to gain an insight into the implementation mechanism, we have used a loop to get the properties of "obj", in effect removing the "cache" object attached

simple caching system I've modeled on jquery myself: Copy Code code as follows: var cachedata = {},//Global object used to store data UUID = 0, declaring random numbers expando = "CacheData" (New Date () ""). Slice (-8); var data = function (key, Val, data) { if (typeof key = = "string") { if (val!== undefined) { Cachedata[key] = val; } return Cachedata[key]; } else if (typeof key = = = "Object") { var index, thiscache;

only needs to store a simple attribute, in this way, the risk of Memory leakage caused by DOM elements can be minimized. The following is a simple cache system I wrote by simulating jQuery: The Code is as follows: Var cacheData ={}, // global object used to store dataUuid = 0,// Declare a random numberExpando = "cacheData" (new Date () ""). slice (-8 );Var data = function (key, val, data ){If (typeof key = "string "){If (val! = Undefined ){CacheData [key] = val;} Return cacheData [key];}Else i

. On the issue of memory recycling for. Data, there is a lot of memory leaks on the web, in the Http://forum.jquery.com/topic/data-object-and-memory-leak of jquery forum: The current $.data implementation is optimized to host objects only, and not for native objects.In fact, it uses the cache object to store all related the data and a expando with numerical values to keep references.The need of such solution is unquestionable and it fits down because

In jQuery, private data can be stored for each DOM object. Of course, this data must be accessed through attributes. But what if there are multiple attributes ?, Do you want to define multiple attributes ?, What is the name of an attribute? Will it conflict with other attributes? In jQuery, the private data extended for DOM objects can be represented by one object. Multiple data are represented by multiple attributes of this object. In order to be able to find this extended data object through t

Previous:Simulation code of jQuery principles-1 core part In jQuery, private data can be stored for each DOM object. Of course, this data must be accessed through attributes. But what if there are multiple attributes ?, Do you want to define multiple attributes ?, What is the name of an attribute? Will it conflict with other attributes? In jQuery, the private data extended for DOM objects can be represented by one object. Multiple data are represented by multiple attributes of this object. In or

Of course, this data must be accessed through attributes. But what if there are multiple attributes ?, Do you want to define multiple attributes ?, What is the name of an attribute? Will it conflict with other attributes? In jquery, the private data extended for DOM objects can be represented by one object. Multiple data are represented by multiple attributes of this object. In order to be able to find this extended data object through the DOM object without conflicting with other existing attri

Of course, this data must be accessed through attributes. But what if there are multiple attributes ?, Do you want to define multiple attributes ?, What is the name of an attribute? Will it conflict with other attributes?In jQuery, the private data extended for DOM objects can be represented by one object. Multiple data are represented by multiple attributes of this object. In order to be able to find this extended data object through the DOM object without conflicting with other existing attrib

;? div[ 0].innerhtml = ""; // direct use of innerHTML, resulting in $.cache {"Data": "Test"} was not purged, resulting in a memory leak ? // div.html (""); If you use jquery's HTML, the {"Data" in $.cache is cleared: "Test"} So jquery2.x is not using the jquery1.x Jquery.cache, but rather a simpler design.As I am looking at the jquery2.2-stable version of the source code, so the following source analysis if not specified version, refers to the jquery2.x version. questio