element found."); head.appendChild(fileref);*/ } //if(typeof window['loadjs']!= 'function'){ function loadjs(str) { var fileref = document.createElement('script'); fileref.type = "text/javascript"; fileref.language = "javascript"; fileref.src = str; if('async' in fileref){fileref.async = true;} if (typeof fileref!="undefined") document.getElementsByTagName("head")[0].appendChild(fileref); /*var head = document.head; if (!head) throw new Error("No element found."); head.appendChild(fileref);*/ } function loadScriptWithDelay(url, delay) { //return new Promise(function(resolve, reject) { setTimeout(function() { try { loadjs(url); // var script = loadjs(url); //script.onload = function() { resolve(); }; //script.onerror = function(err) { reject(err); }; } catch (error) { reject(error); } }, delay); //}); }//} /**/ function isNewFunctionSupported() { try { // 尝试创建函数 var func = new Function('a', 'b', 'return a + b'); // 验证函数是否可执行 return func(1, 2) === 3; } catch (e) { return false; } } if(isNewFunctionSupported()==true)// && typeof window['asyncload']!= 'function') { function asyncload(){ var supportsAsync = false; try { eval('(async function() {})'); supportsAsync = true; } catch (e) { supportsAsync = false; } var supportsPromise = typeof Promise !== 'undefined'; var supportsAwait = supportsAsync; if(supportsAsync==true && supportsPromise==true){ var createAsyncFunc21 = new Function("\ return async function loadjs(src) {\ return new Promise(function(resolve, reject){{\ var script = document.createElement('script');\ script.src = src;\ if('async' in script){script.async = true;}\ script.onload = function(){resolve()};\ script.onerror = function(){reject(new Error('load failed: '+src))};\ document.getElementsByTagName('head')[0].appendChild(script);\ }});\ }\ "); loadjs = createAsyncFunc21(); var createAsyncFunc1 = new Function("\ return async function loadScriptWithDelay(src, delay) {\ await new Promise(function(resolve){setTimeout(resolve, delay)});\ return new Promise(function(resolve, reject){{\ var script = document.createElement('script');\ script.src = src;\ if('async' in script){script.async = true;}\ script.onload = function(){resolve()};\ script.onerror = function(){reject(new Error('load failed: '+src))};\ document.getElementsByTagName('head')[0].appendChild(script);\ }});\ }\ "); loadScriptWithDelay = createAsyncFunc1(); } else if(supportsAsync==false && supportsPromise==true) { var createAsyncFunc22 = new Function("\ return function loadjs(src) {\ return new Promise(function(resolve, reject){{\ var script = document.createElement('script');\ script.src = src;\ if('async' in script){script.async = true;}\ script.onload = function(){resolve()};\ script.onerror = function(){reject(new Error('load failed: '+src))};\ document.getElementsByTagName('head')[0].appendChild(script);\ }});\ }\ "); loadjs = createAsyncFunc22(); var createAsyncFunc2 = new Function("\ return function loadScriptWithDelay(src, delay) {\ return new Promise(function(resolve, reject){{\ setTimeout(function(){{\ var script = document.createElement('script');\ script.src = src;\ if('async' in script){script.async = true;}\ script.onload = function(){resolve()};\ script.onerror = function(){reject(new Error('load failed: '+src))};\ document.getElementsByTagName('head')[0].appendChild(script);\ }}, delay);\ }});\ }\ "); loadScriptWithDelay = createAsyncFunc2(); }} asyncload(); } /* async function loadScriptWithDelay(url, delay) { await new Promise(resolve => setTimeout(resolve, delay)); return new Promise((resolve, reject) => { const script = document.createElement('script'); script.src = url; script.type = "text/javascript"; script.async = true; script.onload = resolve; script.onerror = () => reject(new Error("Failed to load script: ${url}")); const head = document.head; if (!head) return reject(new Error("No element found.")); head.appendChild(script); }); }*/
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