请问我想要子数组的每一个 rightPercent 的和。该怎么办?
function sum(arr) { return arr.reduce(function(s1, c1){ return s1 + c1.reduce(function(s2, c2){ return s2 + c2.rightPercent; }, 0); }, 0); } sum([[{rightPercent: 10}], [{rightPercent: 10}, {rightPercent: 10}]]); // 30
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