实现数组groupBy分类功能

/**
* js根据字段groupBy，field为key，过滤后的值为value
* @param array
* @param field
* @returns {field: [value]}
* @author qyt
*/
function groupBy(array, field) {
    const groups = {}
    array.forEach((o) =>{
        const group = o[field]
        groups[group] = groups[group] || []
        groups[group].push(o)
    })
    return groups
}