如果不知道这是否最有效，但可能最短
A = [1, 2, 3, 4];B = [1, 3, 4, 7];diff = A.filter(function(x) { return B.indexOf(x) < 0 })console.log(diff);更新到ES6：
A = [1, 2, 3, 4];B = [1, 3, 4, 7];diff = A.filter(x => !B.includes(x) );console.log(diff);
如果不知道这是否最有效，但可能最短
A = [1, 2, 3, 4];B = [1, 3, 4, 7];diff = A.filter(function(x) { return B.indexOf(x) < 0 })console.log(diff);更新到ES6：
A = [1, 2, 3, 4];B = [1, 3, 4, 7];diff = A.filter(x => !B.includes(x) );console.log(diff);
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