为什么.find()比选择器更有效? [英] Why is .find() more effective than a selector?

问题描述

webstorm(intellij)说

webstorm (intellij) says

$('#cards').find('.box .row')

比

$('#cards .box .row')

但是..为什么呢?我本以为这实际上是另一种方式

But.. why? I would had thought it would be other way actually

推荐答案

根据快速的jsPerf测试，实际上，它无需使用.find()方法就可以更快.

According to a quick jsPerf test, it's actually quicker without using the .find() method.

完全有可能结果因浏览器而异，但是似乎单个查询的速度明显要快得多.

It's entirely possible that the results may differ depending on your browser, but it seems like a single query is significantly faster.

结果:

// Fastest
// 112,996 operations
var text = $('#cards .box .row').text();

// 39% slower
// 69,350
var text = $('#cards').find('.box .row').text();

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