// array of [key, value] pairslet map = new Map([['1', 'str1'],[1, 'num1'],[true, 'bool1']]);alert( map.get('1') ); // str1 可以使用对象进行初始化 let obj = {name: "John",age: 30};let map = new Map(Object.entries(obj));alert( map.get('name') ); // Joh...
map( (value, currentValue, currentIndex, array)=> { return value * 10; }); console.log(mappedValue) //returns [10,20,30] 使用reduce方法允许您通过将数组的所有值相加来创建一个值,使用第一个值作为起点,并将所有其他元素的值加到第一个值上:let reducedValue = [10,1,2,3,4,5,6,7,8,9]...
DOCTYPEhtml><html><head><meta charset="UTF-8"><title>extend</title></head><body><button>按钮1</button><button>按钮2</button><input type="text"value="username"/><input type="text"value="password"/><script src="js/jQuery1.11.3/jquery-1.11.3.min.js"type="text/javascript"charset="ut...
test(value)) { return errorMsg } } } var Validator = function() { this.cache = [] // 保存校验规则 } Validator.prototype.add = function(dom, rules) { var self = this for (var i = 0, rule; (rule = rules[i++]); ) { // @蝉時雨:没有必要用立即执行函数表达式,用 forEach ...
const url = document.getElementById('queryURL').value;const myData = tf.data.csv(url); ***1***await myData.take(10).forEach(x => console.log(JSON.stringify(x))); ***2***// Output is like// {"crim":0.26169,"zn":0,"indus":9.9,"chas":0,"nox":0.544,"rm":6.023, ......
tb=newDraw(map); tb.on("draw-end",addGraphic); // event delegation so a click handler is not // needed for each individual button on(dom.byId("info"),"click",function(evt){ if(evt.target.id==="info"){ return; } vartool=evt.target.id.toLowerCase(); ...
**on(map,"layers-add-result",function(evt) {**console.log("1.", earthQuakeLayer.id); ...console.log("5.", worldCities.layerInfos); }); 任何命令行输入或输出都是这样写的: **1\.EarthquakeLayer** **2\. [Object,** **Object,** ...
A free and efficient obfuscator for JavaScript (including ES2017). Make your code harder to copy and prevent people from stealing your work. 它是支持 ES8 的免费、高效的 JavaScript 混淆库,它可以使得你的 JavaScript 代码经过混淆后难以被复制、盗用,混淆后的代码具有和原来的代码一模一样的功能。
map.addLayer(base);map.addLayer(img); 在这种情况下,map.addlayer()的顺序就是index的顺序,即base在底层,img在上层,如图: 正常情况 代码语言:javascript 代码运行次数:0 运行 AI代码解释 map.addLayer(base,1);map.addLayer(img,0); 加入inde参数之后,base在上,img在下,如图所示: ...
A Map holds key-value pairs where the keys can be any datatype. A Map remembers the original insertion order of the keys. How to Create a Map You can create a JavaScript Map by: Passing an Array tonew Map() Create a Map and useMap.set() ...