[1,2,3,4,5,6,7,8,9,2,2,3,3,4,1].filter(function(el,index,arr){
return (index === arr.indexOf(el));
})
数组去重的三种方法 es6
https://www.tongbiao.xyz/
[1,2,3,4,5,6,7,8,9,2,2,3,3,4,1].filter(function(el,index,arr){
return (index === arr.indexOf(el));
})