工具函数的封装

 

export const flattenArr = (arr) => {

    return arr.reduce((map,item)=>{

        map[item.id] = item

        return map

    },{})

}

export const objToArr = (obj) => {

    return Object.keys(obj).map(key => obj[key])

}

// 获取父节点 dom 元素

export const getParentNode = (node,parentClassName) => {

    let current = node

    while(current !== null){

        if(current.classList.contains(parentClassName)){

            return current

        }

        current = current.parentNode

    }

    return false

}