jQuery数据函数

见- http://api.jquery.com/data/

我相信你要找的是 James Padolsey's jQuery SourceCode viewer

// The following elements throw uncatchable exceptions if you
    // attempt to add expando properties to them.
    noData: {
        "embed": true,
        "object": true,
        "applet": true
    },

    data: function( elem, name, data ) {
        if ( elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()] ) {
            return;
        }

        elem = elem == window ?
            windowData :
            elem;

        var id = elem[ expando ], cache = jQuery.cache, thisCache;

        if ( !id && typeof name === "string" && data === undefined ) {
            return null;
        }

        // Compute a unique ID for the element
        if ( !id ) { 
            id = ++uuid;
        }

        // Avoid generating a new cache unless none exists and we
        // want to manipulate it.
        if ( typeof name === "object" ) {
            elem[ expando ] = id;
            thisCache = cache[ id ] = jQuery.extend(true, {}, name);

        } else if ( !cache[ id ] ) {
            elem[ expando ] = id;
            cache[ id ] = {};
        }

        thisCache = cache[ id ];

        // Prevent overriding the named cache with undefined values
        if ( data !== undefined ) {
            thisCache[ name ] = data;
        }

        return typeof name === "string" ? thisCache[ name ] : thisCache;
    },

    removeData: function( elem, name ) {
        if ( elem.nodeName && jQuery.noData[elem.nodeName.toLowerCase()] ) {
            return;
        }

        elem = elem == window ?
            windowData :
            elem;

        var id = elem[ expando ], cache = jQuery.cache, thisCache = cache[ id ];

        // If we want to remove a specific section of the element's data
        if ( name ) {
            if ( thisCache ) {
                // Remove the section of cache data
                delete thisCache[ name ];

                // If we've removed all the data, remove the element's cache
                if ( jQuery.isEmptyObject(thisCache) ) {
                    jQuery.removeData( elem );
                }
            }

        // Otherwise, we want to remove all of the element's data
        } else {
            if ( jQuery.support.deleteExpando ) {
                delete elem[ jQuery.expando ];

            } else if ( elem.removeAttribute ) {
                elem.removeAttribute( jQuery.expando );
            }

            // Completely remove the data cache
            delete cache[ id ];
        }
    }

在使用本软件之前,您需要注意一些规则!

添加

添加对象会将对象放置在数据对象内,并“扩展以前与该元素一起存储的数据”- http://api.jquery.com/data/#entry-longdesc

这意味着将obj添加到dataObj

dataObj === { /*previous data*/, obj : { } }

使用

如果您存储了简单的值,则可以将它们放入变量中,并在不更改数据对象的情况下对它们执行所需的操作。

如果使用对象或数组在元素上存储数据,请小心!

仅仅因为将其存储到变量中并不意味着不更改数据值。

这就是它的本来面目。。除非很简单。。那只是一份拷贝。:p页

var data             = $("#id").data();  // Get a reference to the data object 
data.r_redirect      = "index.php";      // Add a string value
data.num             = 0;                // Add a integer value
data.arr             = [0,1,2];          // Add an array
data.obj             = { a : "b" };      // Add an object

                                         // but here is where the fun starts! 

var r_redirectString = data.r_redirect;  // returns "index.php", as expected.. cool
r_redirectString     = "changed"         // change the value and the compare :
data.r_redirect      == r_redirectString // returns false, the values are different

var oArr             = data.arr;         // Now lets copy this array
oArr.push(3);                            // and modify it.
data.arr            == oArr              // should be false? Nope. returns true.
                                         // arrays are passed by reference.
                                         // but..

var oObj             = data.obj          // what about objects?       
oObj["key"]          = "value";          // modify the variable and
data.obj["key"]     == oObj["key"]       // it returns true, too!

所以,资源。。

What's the best way to store multiple values for jQuery's $.data()? https://stackoverflow.com/a/5759883/1257652