let arr = ['3', '2', '1']
arr.length = 4
// console.log(arr);
let arr1 = arr.filter(d => d)
console.log(arr); // ["3", "2", "1", empty]
console.log(arr1); // ["3", "2", "1"]
注意:filter不会改变原数组
js数组中如何过滤empty 空值
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转载自blog.csdn.net/m0_63873004/article/details/125781620
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