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1.不改变现有数组

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2.改变现有数组

| | —- | —- | —- | | 1 | Array.prototype.concat | Array.proptotype.copyWidthin | | 2 | Array.prototypt.every | Array.prototype.fill | | 3 | Array.proptotype.filter | Array.prototype.pop | | 4 | Array.prototype.find | Array.prototype.push | | 5 | Array.prototype.findIndex | Array.prototype.slice | | 6 | Array.prototype.flat | Array.prototype.splice | | 7 | Array.prototype.flatMap | Array.prototype.shift | | 8 | Array.prototype.forEach | Array.prototype.unshift | | 9 | Array.prototyot.from | Array.prototype.reverse | | 10 | Array.prototype.inclues | | | 11 | Array.proptotye.indexof | | | 12 | Array.proptotye.isArray | | | 13 | Array.proptotye.join | | | 14 | Array.proptotye.lastIndexof | | | 15 | Array.proptotye.map | | | 16 | Array.proptotye.reduce | | | 17 | Array.proptotype.some | | | 18 | Array.prototype.sort | | | 19 | Array.prototype.toString | | | | | |