ES6模板文字是否比字符串连接更快？ [英] Are ES6 template literals faster than string concatenation?
问题描述
例如：
字符串连接
< body>+
< article>+
< time datetime ='+ date.toISOString（）+'>+ date +< / time>+
article>+
< / body>
模板文字
`<身体GT;
< article>
< time datetime ='$ {date.toISOString（）}'> $ {date}< / time>
< / article>
< / body>`
似乎此时字符串连接更快： http://jsperf.com/ es6-string-literals-vs-string-concatenation
ES6与变量19,992,512 ±5.21％78％更低
带变量的字符串连接89,791,408±2.15％最快
ES6功能461,358±3.12％99％慢
字符串连接功能503,255±1.77％99％慢
我测试的是运行在Chrome 43.0.2334.0金丝雀（64位），它正在使用V8 4.3.31 ，启用＃enable-javascript-harmony 标志。
为了参考，Node.js上的最新版本（写入时为0.12.0）正在使用V8 3.28.73：https://raw.githubusercontent.com/joyent/node/master/ChangeLog
我确定可能应用的所有可能的性能优化尚未应用，因此，随着ES6更接近完成，这些功能将被迁移到稳定的分支，希望性能更好的是合理的。
Has anyone done benchmarks? I'm curious if HTML generation code is faster with string concatenation or with template literals in Node and modern browsers.
For example:
String concatenation
"<body>"+
"<article>"+
"<time datetime='" + date.toISOString() +"'>"+ date +"</time>"+
"</article>"+
"</body>"
Template literal
`<body>
<article>
<time datetime='${ date.toISOString() }'>${ date }</time>
</article>
</body>`
It seems for the moment string concatenation is faster: http://jsperf.com/es6-string-literals-vs-string-concatenation
ES6 with variable 19,992,512 ±5.21% 78% slower
String concatenation with variable 89,791,408 ±2.15% fastest
ES6 with function 461,358 ±3.12% 99% slower
String concatenation with function 503,255 ±1.77% 99% slower
I tested was run on Chrome 43.0.2334.0 canary (64-bit), which is using V8 4.3.31, with the #enable-javascript-harmony flag enabled.
For reference, the latest version on Node.js (0.12.0 at the time of writing) is using V8 3.28.73: https://raw.githubusercontent.com/joyent/node/master/ChangeLog
I'm sure all the possible performance optimizations that could be applied have not been applied yet, so it would be reasonable to expect performance to get better as ES6 gets closer to finalization and these features get migrated to the stable branch.
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