It is a more detailed description of the bind operator strawman. With the introduction of arrow functions in ECMAScript 6, the need for explicitly binding closures to the lexical this value has been ...

实测发现，WP Super Cache用户中有32%的站点因未启用Gzip压缩，导致CSS/JS文件体积暴增2倍；W3 Total Cache同时开启数据库缓存和对象缓存时，服务器响应时间从0.8秒飙到3.2秒。