1, Array.of (); ---- converting a set of data into an array;
201314 NUM = const ; const A = Array.of (NUM); the console.log (A); // array of a length;
2. includes (); ----- detecting a particular array there, returns a Boolean value, if returns true, false if not;
ARR = the let [2,3,45,6,9 ]; the let A = arr.includes (. 9 ); the console.log (A) // detector array there is no particular one! ! It returns a Boolean value; true / false;
3. fill (parameter 1, parameter 2, parameter 3) replacement of array elements;
ARR = the let [1,4,7,2,5,8,3 ] the let of arr1 = arr.fill (88,2,4 ); the console.log (of arr1) // replace array elements; first parameter added to the number; the second parameter is the index of the start, the third parameter is the end of the index,
4. find ((value, index, arr) => {}) According to a recent condition returns to enjoy life and the condition value; parameter is a callback function, if not, return -1;
ARR = the let [1,2,3,5,8,6 ] the let arr2 is = arr.find ((value, index, ARR) => { // return index>. 3; ----. 8, greater than the current index a recent value; // a recent --- 5, is greater than the current value;; return value>. 3 }) // // return to the condition according to the condition matching a latest value; // the console.log (arr2)
5.findIndex (() => {}); return satisfies the test condition first array index entry; if not, it returns -1
ARR = the let [2,1,5,6,9,7 ]; the let of arr1 = arr.findIndex ((value) => { return value>. 5; ----. 3 }) // Returns satisfies the test condition an index entry array console.log (arr1)
6. Array.from () transferred the dummy array into an array;
Array.from () dummy array into an array var DOM document.getElementsByTagName = ( '*' ); var ARR = Array.from (DOM); the console.log (ARR);