log(Object.values(employee)); 我们只能在数组上调用map()方法,所以我们需要获得一个对象的键或者对象的值的数组。 参考资料 [1] https://bobbyhadz.com/blog/react-map-is-not-a-function: https://bobbyhadz.com/blog/react-map-is-not-a-function [2] Borislav Hadzhiev: https://bobbyhadz.com/...
解析: 分为两部分:(1)children是Object,并且$$typeof是REACT_ELEMENT_TYPE/REACT_PORTAL_TYPE 调用callback即mapSingleChildIntoContext,复制除key外的属性,替换key属性,将其放入到result中 (2)children是Array 循环children,再用traverseAllChildrenImpl执行child ...
Pass an options object into new mapboxgl.Map() to control the map. In this example, only the container option is specified as mapContainerRef.current. Mapbox GL JS will create the new map in your map container div. new mapboxgl.Map() returns new instance of the Map class, and is ...
B. Then I get an error anytime I try to access the objects properties, for example, if in the above code I comment out anything that hasthis.somethingin it then the code executes just fine, otherwise it gives the error: TypeError: undefined is not an object (evaluating 'this.__reactAu...
import React, { useRef, useEffect, useState } from "react"; import Sss from "../../images/index/sss.png"; import SssActive from "../../images/index/sss-on.png"; // 按需引入Echarts import * as echarts from "echarts/core"; import { TitleComponent, ToolboxComponent, TooltipComponent...
const [openModal, setOpenModal] = useState(false); <GoogleMapReact ... onClick={e => { if (!e.event.target.closest('.marker-modal')) { setOpenModal(false); } }} ... /> 👍2🎉1 Sign up for freeto join this conversation on GitHub.Already have an account?Sign in to comment...
Keep in mind that the first argument will return an array. TheuseInViewEffecthook has more limited options that mirror the default API. {root?:RefObject<Element>|null,// Optional, must be a parent of your refrootMargin?:string,// '0px' or '0px 0px 0px 0px', also accepts '%' un...
An image map, with clickable areas: <imgsrc="workplace.jpg"alt="Workplace"usemap="#workmap"width="400"height="379"> <mapname="workmap"> <areashape="rect"coords="34,44,270,350"alt="Computer"href="computer.htm"> <areashape="rect"coords="290,172,333,250"alt="Phone"href="phone....
The Mapbox GL JSaddLayermethod adds a Mapbox style layer to the map's style. The only required parameter foraddLayeris a Mapbox style layer object. It also accepts an optionalbeforeparameter, which is the ID of an existing layer to insert the new layer before. If you omit this argument...
Thekeys()method returns an iterator object with the keys in a map: Example // List all keys lettext =""; for(constx of fruits.keys()) { text += x; } Try it Yourself » Map.values() Thevalues()method returns an iterator object with the values in a map: ...