push multiple elements to array

You can push multiple elements into an array in the following way

var a = [];
    
a.push(1, 2, 3);

console.log(a);

Now in ECMAScript2015 (a.k.a. ES6), you can use the spread operator to append multiple items at once:

var arr = [1];
var newItems = [2, 3];
arr.push(...newItems);
console.log(arr);

See Kangax's ES6 compatibility table to see what browsers are compatible

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