javascript程序的执行效率问题

写了几年代码，很少谈到javascript程序的执行效率问题，今天就举几个例子看看，让大家看看程序优化是多么重要。
这节来看看createElement和innerHTML的表现。看看差别是多大

createElement:

运行代码框
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target="_blank">[ 查看全文 ]</a></div> <div class="span_em "> <div class="cai_list_font"><a href="/user/玉雅翡翠珠宝店/" target="_blank"><img src="https://static.tulaoshi.com/html/tulaoshi_new/images/touxiang/4.jpg" /><span>玉雅翡翠珠宝店</span></a></div> <span class="font_span"><a class="em_s" href="javascript:;">1</a><a class="em_s2" href="javascript:;">1</a></span></div> </div> </li> <li> <div class="xiang_892_2_1"><a href="/reader/1626059" target="_blank"><img src="https://img.tulaoshi.com/201602/19/e2dd642ff9c38d9de78e5df8c77e01b1_thumb_189.jpg" width="224" height="173"></a></div> <div class="xiang_right clearfix"> <div class="xiang_right_1"><A href="https://www.tulaoshi.com/n/20160219/1626059.html" target="_blank">JavaScript程序构成</A></div> <div class="xiang_righ_lable">标签：<a href="https://www.tulaoshi.com/webkaifa/" target="_blank">Web开发</a></div> <div class="span_em_123"> JavaScript脚本语言的基本构成是由控制语句、函数、对象、方法、属性等,来实现编程的。一、程序控制流在任何一种语言中，程序控制流是必须的，它能使得整个程序减小混乱，使之顺利按其一定的方式执行。下面是JavaScript常用的程序控制流结构及语句: 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