author:xtx introduce:XSky(1992~),was born in China HeBei Province, HengShui city.I'm a javascript progrmmer. 2006~2009 Study in HengShui First Medium School,when I was in this school ,I joined ACM team. 2009~2013 Study in BeiJing Forestry University.During in collage,I studyed html,css,less,and js. 2012.10~2013.4 Worked in FreeBit 2013.4~2013.10 Worked in 36kr 2013.10~ Working in sina AMD is a little require SDK,you can use it as AMD tools. AMD/LETcore,AMD/LETselector is a base util.It contains callbacks,deferred,selector.