可见性
隐藏对象没有宽高,前提是用display:none处理的
jQuery.expr.filters.hidden = function( elem ) { // Support: Opera <= 12.12 // Opera reports offsetWidths and offsetHeights less than zero on some elements return elem.offsetWidth <= 0 && elem.offsetHeight <= 0; }; jQuery.expr.filters.visible = function( elem ) { return !jQuery.expr.filters.hidden( elem ); };
内容
获取文本内容通过indexOf匹配
"contains": markFunction(function( text ) { return function( elem ) { return ( elem.textContent || elem.innerText || getText( elem ) ).indexOf( text ) > -1; }; }),
取空
递归这个节点,排除nodeType大于6的节点
// Contents "empty": function( elem ) { // http://www.w3.org/TR/selectors/#empty-pseudo // :empty is negated by element (1) or content nodes (text: 3; cdata: 4; entity ref: 5), // but not by others (comment: 8; processing instruction: 7; etc.) // nodeType < 6 works because attributes (2) do not appear as children for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) { if ( elem.nodeType < 6 ) { return false; } } return true; },
查看包含
递归sizzle通过传递上下文对象,实现包含查找
"has": markFunction(function( selector ) { return function( elem ) { return Sizzle( selector, elem ).length > 0; }; }),
匹配含有子元素或者文本的元素
"parent": function( elem ) { return !Expr.pseudos["empty"]( elem ); },
sizzle分析记录: 自定义伪类选择器
时间: 2024-10-09 11:01:35