多个数组(数量不定)例如三个数组 {a,b} {1,2} {d}排列组合后为a,1,da,2,db,d是js的算法哦

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<code class="javascript keyword">var <code class="javascript plain">arr = [[<code class="javascript string">"a"<code class="javascript plain">,<code class="javascript string">"b"<code class="javascript plain">],[<code class="javascript string">"1"<code class="javascript plain">,<code class="javascript string">"2"<code class="javascript plain">],[<code class="javascript string">"d"<code class="javascript plain">]];