functionRange(start,stop,step){returnArray.from({length:(stop - start)/step+1},(_,i)=>start+(i*step));}console.log(Range(0,5,1))// [0, 1, 2, 3, 4, 5]console.log(Range(0,9,3))// [0, 3, 6, 9]console.log(Range('A'.charCodeAt(0),'Z'.charCodeAt(0),1).map(...
functionrange(start, end, step =1) {returnArray.from({length: (end - start) / step +1},(_, i) =>start + i * step);} 13. 移除重复项 不再需要复杂的过滤操作。让 Set 自行处理。 functionunique(arr) {return[......
function Range(start, stop, step) {return Array.from({ length: (stop - start) / step + 1}, (_, i) => start + (i * step));} console.log(Range(0,5,1)) // [0, 1, 2, 3, 4, 5]console.log(Range(0,...
DOM2 在 Document 类型上定义了一个 createRange()方法,暴露在 document 对象上。使用这个方法可以创建一个 DOM 范围对象。与节点类似,这个新创建的范围对象是与创建它的文档关联的,不能在其他文档中使用。然后可以使用这个范围在后台选择文档特定的部分。创建范围并指定它的位置之后,可以对范围的内容执行一些操作,从...
every 对数组中每一项运行给定函数,如果函数对每一项都返回true,则返回true every(fn(value,index,array){return ...},[this]) 2.some 对数组中每一项运行给定函数,如果函数对任一项都返回true,则返回true 3.filter 对数组中每一项运行给定函数,返回该函数会返回true的项组成的数组 4.forEach 对数组每一项...
getWeekArray(date: TDate): TDate[][]; getYearRange(start: TDate, end: TDate): TDate[]; /** Allow to customize displaying "am/pm" strings */ getMeridiemText(ampm: "am" | "pm"): string; } For library authors If you are a library author that exposes date/time management utils...
Create an array from a string: Array.from("ABCDEFG") Try it Yourself » Description TheArray.from()method returns an array from any object with a length property. TheArray.from()method returns an array from any iterable object. Array.from() ...
The Array map() Method Syntax array.values() Parameters NONE Return Value TypeDescription IteratorAn Iterator object containing the values of an array. More Examples Example Iterate directly over the Iterator: // Create an Array constfruits = ["Banana","Orange","Apple","Mango"]; ...
But we shouldn't lose sight of the goal, which is to create easier-to-understand code. In this case, the for loop is much more declarative than the Array.from alternative. The idea with declarative code is that it describes what you want, not how to do it. In our case, we want ...
除了上面三个对象,Javascript 还拥有 Date、Array、Math 等内置对象,这三个经常显示使用,所以非常熟悉,知道了内置对象就可以看看上面例子是怎么回事儿了。 只要是引用了字符串的属性和方法,Javascript 就会将字符串值通过 new String(s)的方式转为内置对象 String,一旦引用结束,这个对象就会销毁。所以上面代码在使用的...