SOURCE

var groupAnagrams = function(strs) {
    var res = {}
    for(var i=0;i<strs.length;i++){
        var s = strs[i].split('').sort().join('')
        //排序后字母不相同，则初始化数组为空
        console.log(s)
        if(!res[s]){
            res[s] = []
        }
        res[s].push(strs[i])
    }
    //console.log(Object.values(res))
    console.log(res)
    return Object.values(res)
};
groupAnagrams(['eat','tea','tan','ate','nat','bat'])