jquery 遍历 filter(fn)

xiaoxiao2021-03-01  5

filter(fn)

将匹配元素集合中不满足‘fn函数’匹配的元素集合删除,形成新的元素集合

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <script src="http://code.jquery.com/jquery-latest.js"></script> <script> $(document).ready(function(){ $("div").css("background", "#b4b0da") .filter(function (index) { return index == 1 || $(this).attr("id") == "fourth"; }) .css("border", "3px double red"); }); </script> <style> div { width:60px; height:60px; margin:5px; float:left; border:3px white solid; } </style> </head> <body> <div id="first"></div> <div id="second"></div> <div id="third"></div> <div id="fourth"></div> <div id="fifth"></div> <div id="sixth"></div> </body> </html>

 

.filter(function (index) { return index == 1 || $(this).attr("id") == "fourth";})将div元素集合中索引为1和id等于‘fourth’以外的div元素都删除,形成新的div元素集合。以下是新的div元素集合

<div id="second"></div><div id="fourth"></div>

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