第三,map() 方法在 Web 控制台中显示结果数组中的每个元素。 以下示例说明了 contextObject 参数的使用,该参数指定可以在 callback() 函数中使用 this 关键字引用的对象。 functionisInRange(value){if(typeofvalue !=='number') {...
map函数 来看一下map函数的参数与返回值 map(func, *iterables) --> map object func:代表传入参数为函数,这里的函数指定指向函数的函数名, *iterables...sequence:是一个序列,是一些数据的集合,或者是一组数据,可迭代对象 initial:可选,初始参数 返回值:返回函数计算的结果 reduce()函数,使用function函数(有...
functionisEmptyObject(value) {returnObject.keys(value).length===0&& value.constructor===Object; } js object empty Checker https://lodash.com/docs/4.17.15#isEmpty https://github.com/lodash/lodash/blob/4.17.15/lodash.js#L11479 functionisEmpty(value) {if(value ==null) {returntrue; }if(is...
constdata={lib:{pkg:{name:'ofilterjs',alias:'',version_number:10001}}}constnewData=ofjs.filterValue(data,{name:'lib.pkg.name'}},{name1:'ofilter'},{name2:'object filter'})console.log(newData)/** resultnewData = {name: 'ofilterjs',name1: 'ofilter',name2: 'object filter'}*/...
array.filter(callback,[ thisObject]) 1234 [1, 2, 3, 4, 5, 6].filter(function (item) { return (item 4 3)})// [5, 6] some 接受一个函数作为参数,所有数组成员依次执行该函数,返回一个布尔值;写法跟上面的filter几乎一样,但是返回的结果,这里是布尔值,也就是说是否满足条件,filter返回的是满...
for(letkeyinJSONObject) { console.log(key +": "+ JSONObject[key]); } // while循环遍历JSON对象属性 letkeys = Object.keys(JSONObject); leti = 0; while(i < keys.length) { console.log(keys[i] +": "+ JSONObject[keys[i]]); ...
Example 1 Return an array of all values in ages[] that are 18 or over: constages = [32,33,16,40]; constresult = ages.filter(checkAdult); functioncheckAdult(age) { returnage >=18; } Try it Yourself » Description Thefilter()method creates a new array filled with elements that pas...
saveAsJSON() // do something with the JSON object (save it as file, send it to a server, etc) // ... // import the same filter from its JSON export const importedFilter = BloomFilter.fromJSON(exported) console.log(filter.has('alice')) // output: true console.log(filter.has('...
{ objectIds: oidsArray } : { where: "1=0" };spatialRelationship Property spatialRelationship String For spatial filters, this parameter defines the spatial relationship to filter features in the layer view against the filter geometry. The spatial relationships discover how features are spatially ...
(译注:此处说法可能不够明确,具体可参考EMCA语言规范:'forEach does not directly mutate the object on which it is called but the object may be mutated by the calls to callbackfn.',即 forEach 不会直接改变调用它的对象,但是那个对象可能会被 callback 函数改变。)...