業(yè)務(wù)場景
微信小程序中多張圖片選擇后一起上傳時(shí)需判斷多張圖片的異步上傳結(jié)果汤功，成功了幾張灸芳，失敗了幾張
最新ES2020已有Promise.allSettled，可在代碼中先查看是否已有
代碼
Promise.allSettled = Promise.allSettled || function(promises) {
return new Promise(function(resolve, reject) {
if (!Array.isArray(promises)) {
return reject(
new TypeError("arguments must be an array")
);
}
var resolvedCounter = 0;
var promiseNum = promises.length;
var resolvedValues = new Array(promiseNum);
for (var i = 0; i < promiseNum; i++) {
(function(i) {
Promise.resolve(promises[i]).then(
function(value) {
resolvedCounter++;
resolvedValues[i] = value;
if (resolvedCounter == promiseNum) {
return resolve(resolvedValues);
}
},
function(reason) {
resolvedCounter++;
resolvedValues[i] = reason;
if (resolvedCounter == promiseNum) {
return reject(reason);
}
}
);
})(i);
}
});
};
