1/* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16export default { 17 18 /** 19 * Check obj is empty. 20 * 21 * @param {object} obj 22 * @return {boolean} true(empty) 23 */ 24 isEmpty(obj) { 25 return (typeof obj == 'undefined' || obj == null || 26 JSON.stringify(obj) == '{}' || JSON.stringify(obj) == 'undefined'); 27 }, 28 29 /** 30 * Check str is empty. 31 * 32 * @param {string} str 33 * @return {boolean} true(empty) 34 */ 35 checkStrIsEmpty(str) { 36 return str.trim().length == 0; 37 }, 38 39 /** 40 * Check array is empty. 41 * 42 * @param {Array}arr 43 * @return {boolean} true(empty) 44 */ 45 isEmptyArr(arr) { 46 return arr.length == 0; 47 }, 48 49 // Convert ArrayBuffer to String ，buff is ArrayBuffer 50 ab2str(buf) { 51 return String.fromCharCode.apply(null, new Uint8Array(buf)); 52 }, 53 54 // Convert String to ArrayBuffer 55 str2ab(str) { 56 var arr = []; 57 for (var i = 0, j = str.length; i < j; ++i) { 58 arr.push(str.charCodeAt(i)); 59 } 60 var tmpUint8Array = new Uint8Array(arr); 61 return tmpUint8Array; 62 }, 63 64 sleep(delay) { 65 for (var t = Date.now(); Date.now() - t <= delay;); 66 } 67} 68