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Date.js
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96 lines (91 loc) · 4.11 KB
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/* Copyright© 2000 - 2021 SuperMap Software Co.Ltd. All rights reserved.
* This program are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution and is available at http://www.apache.org/licenses/LICENSE-2.0.html.*/
import {SuperMap} from '../SuperMap';
/**
* @name Date
* @memberOf SuperMap
* @namespace
* @category BaseTypes Util
* @description 包含 parse、toISOString 方法的实现，两个方法用来解析 RFC 3339 日期，遵循 ECMAScript 5 规范。
*/
export var DateExt = SuperMap.Date = {
/**
* @description 生成代表一个具体的日期字符串，该日期遵循 ISO 8601 标准（详情查看{@link http://tools.ietf.org/html/rfc3339}）。
* @example
* var dateString = SuperMap.Date.toISOString(new Date());
* @param {Date} date - 日期对象。
* @returns {string} 一个代表日期的字符串。（例如 "2010-08-07T16:58:23.123Z"）。
*/
toISOString: (function () {
//标准的Date会存在toISOString方法，可以直接调用
if ("toISOString" in Date.prototype) {
return function (date) {
return date.toISOString();
};
} else {// 部分浏览器没有，就得自己组合，组合后的字符串规则不变
function pad(num, len) {
var str = num + "";
while (str.length < len) {
str = "0" + str;
}
return str;
}
return function (date) {
var str;
if (isNaN(date.getTime())) {
// ECMA-262 says throw RangeError, Firefox returns
// "Invalid Date"
str = "Invalid Date";
} else {
str =
date.getUTCFullYear() + "-" +
pad(date.getUTCMonth() + 1, 2) + "-" +
pad(date.getUTCDate(), 2) + "T" +
pad(date.getUTCHours(), 2) + ":" +
pad(date.getUTCMinutes(), 2) + ":" +
pad(date.getUTCSeconds(), 2) + "." +
pad(date.getUTCMilliseconds(), 3) + "Z";
}
return str;
};
}
})(),
/**
* @description 从一个字符串生成一个日期对象。
* @example
* var date = SuperMap.Date.parse("2010-08-07");
* @param {string} str - 代表日期的字符串。（例如： "2010", "2010-08", "2010-08-07", "2010-08-07T16:58:23.123Z","2010-08-07T11:58:23.123-06"）。
* @returns {Date} 日期对象，如果字符串无法被解析，则返回一个无效的日期。(例如 isNaN(date.getTime()))。
*/
parse: function (str) {
var date;
var match = str.match(/^(?:(\d{4})(?:-(\d{2})(?:-(\d{2}))?)?)?(?:(?:T(\d{1,2}):(\d{2}):(\d{2}(?:\.\d+)?)(Z|(?:[+-]\d{1,2}(?::(\d{2}))?)))|Z)?$/);
if (match && (match[1] || match[7])) { // must have at least year or time
var year = parseInt(match[1], 10) || 0;
var month = (parseInt(match[2], 10) - 1) || 0;
var day = parseInt(match[3], 10) || 1;
date = new Date(Date.UTC(year, month, day));
// optional time
var type = match[7];
if (type) {
var hours = parseInt(match[4], 10);
var minutes = parseInt(match[5], 10);
var secFrac = parseFloat(match[6]);
var seconds = secFrac | 0;
var milliseconds = Math.round(1000 * (secFrac - seconds));
date.setUTCHours(hours, minutes, seconds, milliseconds);
// check offset
if (type !== "Z") {
var hoursOffset = parseInt(type, 10);
var minutesOffset = parseInt(match[8], 10) || 0;
var offset = -1000 * (60 * (hoursOffset * 60) + minutesOffset * 60);
date = new Date(date.getTime() + offset);
}
}
} else {
date = new Date("invalid");
}
return date;
}
};