<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="test">
child text 1<br>
child text 2
<div>
grandchild text 1
<div>grand-grandchild text 1</div>
grandchild text 2
</div>
child text 3<br>
child text 4
</div>
jQuery.fn.descendants = ( textNodes ) ->
# if textNodes is 'all' then textNodes and elementNodes are allowed
# if textNodes if true then only textNodes will be returned
# if textNodes is not provided as an argument then only element nodes
# will be returned
allowedTypes = if textNodes is 'all' then [1,3] else if textNodes then [3] else [1]
# nodes we find
nodes = []
dig = (node) ->
# loop through children
for child in node.childNodes
# push child to collection if has allowed type
nodes.push(child) if child.nodeType in allowedTypes
# dig through child if has children
dig child if child.childNodes.length
# loop and dig through nodes in the current
# jQuery object
dig node for node in this
# wrap with jQuery
return jQuery(nodes)
Javascript版本
var __indexOf=[].indexOf||function(e){for(var t=0,n=this.length;t<n;t++){if(t in this&&this[t]===e)return t}return-1}; /* indexOf polyfill ends here*/ jQuery.fn.descendants=function(e){var t,n,r,i,s,o;t=e==="all"?[1,3]:e?[3]:[1];i=[];n=function(e){var r,s,o,u,a,f;u=e.childNodes;f=[];for(s=0,o=u.length;s<o;s++){r=u[s];if(a=r.nodeType,__indexOf.call(t,a)>=0){i.push(r)}if(r.childNodes.length){f.push(n(r))}else{f.push(void 0)}}return f};for(s=0,o=this.length;s<o;s++){r=this[s];n(r)}return jQuery(i)}