// 因为没有存入过,所以data为undefined // Attempt to get data from the cache // The key will always be camelCased in Data data = dataUser.get( elem, key ); if ( data !== undefined ) { return data; } // 进入dataAttr函数,查找data-*属性 // Attempt to "discover" the data in /...
}//Sets one value}elseif( value !== undefined ) {//单赋值chainable =true;//链式//这种情况也是赋值 如.attr( attributeName, function(index, attr) )传入的value就是一个函数if( !jQuery.isFunction( value ) ) {//如果第四个参数不是函数,raw为trueraw =true; }if( bulk ) {//key为null或...
}//If applicable, access the attribute via the DOM 0 wayif( nameinelem && notxml && !special ) {if( set ) {//We can't allow the type property to be changed (since it causes problems in IE)//rtype = /(button|input)/i,//button 与 input 不允许修改 type属性if( name === "ty...
2. $Dom.data(); 代码语言:javascript 代码运行次数:0 运行 AI代码解释 data: function( key, value ) { var i, name, data,elem = this[ 0 ], attrs = elem && elem.attributes; ... return data; ... } }, 省略绝大部分代码,可以看到,该方法去读取了元素的 attribute,最后返回的 data 会是在...
首先来说一说jQuery中Data实现的大体思路: 数据缓存池,这个缓存池专门用来存储 向 DOM对象或者jQuery对象附加的额外数据。 2 当我们要向DOM对象或者jQuery对象附加额外数据的时候,我们附加的数据其实是保存于这个缓存池中 额外属性,这个属性保存了 附加数据在缓存池中的‘门牌号’(位置或者索引) ...
$("body").data();// { foo: 52, bar: { isManual: true }, baz: [ 1, 2, 3 ] } Using thedata()method to update data does not affect attributes in the DOM. To set adata-*attribute value, useattr. Prior to jQuery 1.4.3,.data( obj )completely replaced all data. Since jQuery...
access( this, function( value ) { //读的话(.html())只读第一个匹配的目标元素的内容所以是this[0] //写的话(.html(xxx))会循环每个匹配的目标并将其innerHTML置为value var elem = this[ 0 ] || {}, i = 0, l = this.length; //当直接调用html(),并且目标元素是元素节点时,$().html(...
Defines an object with additional attributes to be used in a "script" or "jsonp" request. The key represents the name of the attribute and the value is the attribute's value. If this object is provided it will force the use of a script-tag transport. For example, this can be used ...
The only valid values for boolean content attributes are empty string or the full attribute name (e.g. checked="checked").jQuery has historically tried to be helpful here and treated boolean attributes in a special way in the .attr() API:...
Defines an object with additional attributes to be used in a "script" or "jsonp" request. The key represents the name of the attribute and the value is the attribute's value. If this object is provided it will force the use of a script-tag transport. For example, this can be used ...