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javascript - for loop efficiency problem

Is for (var i = 0, len = source.length; i < len; i++) more efficient than for (var i = 0; i < source.length; i++)?

黄舟 2017-05-19 10:10:19

May I ask which one is more efficient?

Which of the following two ways of writing is more efficient? ----------------------------------foreach ($arr as $k => $i){ list($value) = each($arr); echo '<h2 align="center&quo

吴小辰阿 2019-05-13 16:30:05

Which is more efficient, $("#content .abc") or $("#content").find(".abc")?

Which is more efficient, $("#content .abc") or $("#content").find(".abc")?

天蓬老师 2017-06-26 10:50:26

javascript - js efficient element position replacement

js high-efficiency element position replacement ul {code...} two element position replacement

阿神 2017-05-19 10:38:59

mysql - efficiency issues of inner join and left join

Under what circumstances will the execution efficiency of inner join and left join be relatively high?

学习ing 2017-06-24 09:41:36

css3 - Why does margin-left fail at certain resolutions?

Why does the margin-left fail in the two different resolutions in the above picture?

仅有的幸福 2017-06-13 09:23:36

mongodb - springde MongoOperations的find方法查询效率慢

在项目中经常用到 getSession().find(query,Person.class,table); 这个的好处是mongodb数据直接转换成Person类，但问题来了，最近项目中发现这个方法的执行效率太低了。这是为什么了哦？

迷茫 2017-05-02 09:22:11

How to improve the efficiency of php excel export

How to improve the efficiency of phpexcel export (note: the cvs format can be ignored, this export has the operation of operating cells) What I think of now is: Optimizing SQL now has an interface for data details, and now it is to get the ID array of the data to loop through this The project detail...

欧阳克 2017-06-14 10:49:59

Are the efficiency of js replacement and adding object members the same?

As in the title, there are two examples (you can imagine other examples by yourself): {code...} {code...} Which one is more efficient?

曾经蜡笔没有小新 2017-06-12 09:28:17

How to improve the parsing efficiency of python crawler?

What is currently used is to crawl in a multi-threaded manner under the windows environment, using beautifulsoup+lxml for parsing. N crawling threads->parsing queue->1 parsing thread->storage queue->1 The efficiency of the entire execution of the storage thread is stuck i...

世界只因有你 2017-06-12 09:20:36

If PHP uses multi-dimensional arrays, will the efficiency be very low?

When using PHP to do projects, you need to use a data structure to store data, but in PHP, it seems that it can only be stored using arrays. The configuration files of PHP's Laravel and other frameworks all use multi-dimensional arrays, such as: {code...} I think the efficiency of multi-dimensional ...

PHP中文网 2017-06-15 09:22:11