if中判断条件优化

以前写法

if(
    type == 1 ||
    type == 2 ||
    type == 3 ||
    type == 4 ||
){
   //...
}

改造后

使用ES6中数组实例方法includes

const condition = [1,2,3,4];

if( condition.includes(type) ){
   //...
}