JS按照特定的条件对数组进行归类

function groupBy(arr, prop, callback) {

var newArr = [],
tempArr = [];
for (var i = 0, j = arr.length; i < j; i++) {

var result = callback(arr[i], arr[i + 1], prop);

if (result) {

tempArr.push(arr[i]);

} else {
tempArr.push(arr[i]);
newArr.push(tempArr.slice(0));
tempArr.length = 0;
}

}
return newArr;
}

var dates = [{
created_at: “2017-10-23 12:00:00”
}, {
created_at: “2017-10-23 13:00:00”
}, {
created_at: “2017-10-23 14:00:00”
}, {
created_at: “2017-10-24 12:00:00”
}, {
created_at: “2017-10-22 12:00:00”
}, {
created_at: “2017-10-22 12:00:00”
}, {
created_at: “2017-10-25 12:00:00”
}, {
created_at: “2017-10-28 12:00:00”
}, {
created_at: “2017-10-28 11:00:00”
}]

var result = groupBy(dates, ‘created_at’, (a, b, key) => {

var C1 = a[key].split(‘ ‘)[0];
var C2 = null;
try {
C2 = b[key].split(‘ ‘)[0];
} catch (exception) {
C2 = null;
}

return C1 == C2;
});
console.log(result)