lvfulong
94 lines
2.6 KiB
JavaScript
94 lines
2.6 KiB
JavaScript
function async(gen) {
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"use strict";
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var log = console.log;
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var g = gen();
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let nr = null;
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function cast(value) {
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return value instanceof Promise && value.constructor === Promise ? value : new Promise(function () { });
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}
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function thennext(v) {
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nr = g.next(v);
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var p = nr.value;
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nr.done ? (0) : cast(p).then(thennext, function (e) { console.log('async reject:' + e); thennext(null); }).catch(function (r) {
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alert(`${r}
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${r.stack}`);
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});
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}
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thennext(void 0);
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}
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exports.async = async;
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//延时
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function delay(ms) {
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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exports.delay = delay;
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//下载图片
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function loadImage(src) {
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return new Promise((resolve, reject) => {
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var img = new Image();
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img.src = src;
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img.onload = () => { resolve(img); };
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img.onerror = () => {
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//reject('file load err:' + src);
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resolve(null);
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};
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});
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}
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exports.loadImage = loadImage;
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//下载文本文件
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function loadText(src) {
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return new Promise((resolve, reject) => {
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var xhr = new XMLHttpRequest();
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xhr.open('GET', src);
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xhr.onload = () => { resolve(xhr.responseText); };
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xhr.onerror = (e) => {
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//if (reject)
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// reject('download xhr error:' + src + '. e=' + e);
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resolve(null);
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};
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xhr.send();
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});
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}
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exports.loadText = loadText;
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function downloadSync(url, bin, onprog) {
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return new Promise(function (resolve, reject) {
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var f = new conch_File(url);
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var fr = new conch_FileReader();
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fr.setIgnoreError(true);
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fr.onload = () => {
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console.log('download end');
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resolve(fr.result);
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};
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fr.onerror = (e) => { console.log('onerror ' + e);
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//if (reject)
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// reject(e);
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resolve(null);
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};
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fr.onprogress = onprog;
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if (bin)
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fr.readAsArrayBuffer(f);
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else
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fr.readAsText(f);
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});
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}
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exports.downloadSync = downloadSync;
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//直到func返回true,tm是间隔
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function check(func, tm) {
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return new Promise(function (resolve, reject) {
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function checkFunc() {
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if (func()) {
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clearInterval(chker);
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resolve(1);
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}
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}
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var chker = setInterval(checkFunc, tm);
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});
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}
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function regGlobal(window) {
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}
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exports.regGlobal = regGlobal;
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window['async'] = async;
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window['delay'] = delay;
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window['downloadSync'] = downloadSync;
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window['asynccheck'] = check;
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