* 提取对象数组的多个属性数组, * 如 [{'x':1,'y':11,'z':111},{'x':2,'y':22,'z':222}] * 提取 ['x','y'] 得到[{'x':1,'y':11},{'x':2,'y':22}] * @param {*} arr * @param {*} keys * @returns []
(arr, keys = [])
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