javascript利用indexOF()函数统计数组arr("a","b","d","d","c","d...答:function f(i, indexes){ var j = arr.indexOf('d', i); if(j == -1) return indexes; indexes.push(j); return f(++j, indexes);}var arr = ["a","b","d","d","c","d","d"];var indexes = f(0, []);console.log("'d' 出现了:" + indexes....