标签：rand blog jquer 删除 cto http text 技术分享 lock
empty: function() {
var elem,
i = 0;
for ( ; (elem = this[i]) != null; i++ ) {
// Remove element nodes and prevent memory leaks
if ( elem.nodeType === 1 ) {
//循环清除Data数据
jQuery.cleanData( getAll( elem, false ) );
}
// 移除child
while ( elem.firstChild ) {
elem.removeChild( elem.firstChild );
}
// If this is a select, ensure that it displays empty (#12336)
// Support: IE<9
if ( elem.options && jQuery.nodeName( elem, "select" ) ) {
elem.options.length = 0;
}
}
return this;
},
代码中，首先清除了所有的data数据，那么data都包含哪些内容呢？
getALl方法查找到到所有后代元素。jquery的getAll代码如下：
var strundefined = typeof undefined;
function getAll( context, tag ) {
var elems, elem,
i = 0,
found = typeof context.getElementsByTagName !== strundefined ? context.getElementsByTagName( tag || "*" ) :
typeof context.querySelectorAll !== strundefined ? context.querySelectorAll( tag || "*" ) :
undefined;
if ( !found ) {
for ( found = [], elems = context.childNodes || context; (elem = elems[i]) != null; i++ ) {
if ( !tag || jQuery.nodeName( elem, tag ) ) {
found.push( elem );
} else {
jQuery.merge( found, getAll( elem, tag ) );
}
}
}
return tag === undefined || tag && jQuery.nodeName( context, tag ) ?
jQuery.merge( [ context ], found ) :
found;
}
getAll(document.body,false);// HTMLCollection Array
将getALl取到的集合， cleanData
$(‘body‘).on(‘click‘,function(){
alert(‘this is body‘);
});
console.log($.cache[$(‘body‘)[0][$.expando]]);
简单的说empty，首先循环给后代元素移除绑定、清除jquery给此dom的cache，然后循环removeFirstChild。
而html(‘‘)，则是简单暴力的设置innerHTML = ‘‘;
转自：http://www.cnblogs.com/henryli/archive/2014/02/25/3566461.html
标签：rand blog jquer 删除 cto http text 技术分享 lock
原文地址：https://www.cnblogs.com/catgatp/p/9498525.html
