dom一些常用的操作方法介绍
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//查找相关元素的前一个兄弟元素的方法。 | |
function prev(elem) { | |
do { | |
elem = elem.previousSibling; | |
} while (elem && elem.nodeType != 1); | |
return elem; | |
} | |
//查找相关元素的下一个兄弟元素的方法。 | |
function next(elem) { | |
do { | |
elem = elem.nextSibling; | |
} while (elem && elem.nodeType != 1); | |
return elem; | |
} | |
//查找元素第一个子元素的方法。 | |
function first(elem) { | |
elem = elem.firstChild; | |
return (elem && elem.nodeType != 1) ? next(elem) : elem; | |
} | |
//查找元素的最后一个子元素的方法。 | |
function last(elem) { | |
elem = elem.lastChild; | |
return (elem && elem.nodeType != 1) ? prev(elem) : elem; | |
} | |
//查找元素指定层级的父元素。 | |
function parent(elem, num){ | |
num = num || 1; | |
for( var i = 0; i < num; i++) | |
if(elem != null) elem = elem.parentNode; | |
return elem; | |
} |
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IE8之前的浏览器不支持HTMLELement