JS_删除数组里的无效数据 0 undefined ‘‘ null false NaN
const arr = [false, 0, undefined, , '', NaN, 9, true, null, 'test']
const arr1 = arr.filter(Boolean)
console.log(arr1) //[0, 9, 'test']
const arr = [false, 0, undefined, , '', NaN, 9, true, null, 'test']
const arr1 = arr.filter(Boolean)
console.log(arr1) //[0, 9, 'test']