数组去重的方法

法一：form()叠加new  Set()

var  plants = ['Saturn','Earth','Uranus','Mercury','Venus','Earth','Mars','Jupiter']

varuniquePlants=Array.from(newSet(plants));

console.log(uniquePlants);// [ 'Saturn', 'Earth', 'Uranus', 'Mercury', 'Venus', 'Mars', 'Jupiter' ]

法二：spread操作符(…)

var  plants = ['Saturn','Earth','Uranus','Mercury','Venus','Earth','Mars','Jupiter'];

var uniquePlants = [...newSet(plants)];

console.log(uniquePlants);// [ 'Saturn', 'Earth', 'Uranus', 'Mercury', 'Venus', 'Mars', 'Jupiter' ]