Date.prototype.format = function (fmt) {
|
var o = {
|
'M+': this.getMonth() + 1, //月份
|
'd+': this.getDate(), //日
|
'h+': this.getHours(), //小时
|
'm+': this.getMinutes(), //分
|
's+': this.getSeconds(), //秒
|
'q+': Math.floor((this.getMonth() + 3) / 3), //季度
|
S: this.getMilliseconds() //毫秒
|
};
|
if (/(y+)/.test(fmt)) {
|
fmt = fmt.replace(
|
RegExp.$1,
|
(this.getFullYear() + '').substr(4 - RegExp.$1.length)
|
);
|
}
|
for (var k in o) {
|
if (new RegExp('(' + k + ')').test(fmt)) {
|
fmt = fmt.replace(
|
RegExp.$1,
|
RegExp.$1.length == 1 ? o[k] : ('00' + o[k]).substr(('' + o[k]).length)
|
);
|
}
|
}
|
return fmt;
|
};
|
|
Array.prototype.lastCount = function (size) {
|
const l = this.length;
|
const s = size > this.length ? 0 : this.length - size;
|
return this.slice(s, l);
|
};
|
|
Array.prototype.groupBy = function (func) {
|
const groups = {};
|
this.forEach((item) => {
|
const key = func(item);
|
if (!groups[key]) {
|
groups[key] = [];
|
}
|
groups[key].push(item);
|
});
|
return Object.keys(groups).map((key) => ({
|
key,
|
values: groups[key]
|
}));
|
};
|
