class="hljs-string">"#FFF"</span>; 
        $back1[<span class="hljs-number">1</span>][<span class="hljs-number">0</span>]= <span class="hljs-string">"1"</span>;
        $back1[<span class="hljs-number">1</span>][<span class="hljs-number">1</span>]= <span class="hljs-string">"#333"</span>; 
        $back2[<span class="hljs-number">0</span>][<span class="hljs-number">0</span>]= <span class="hljs-string">"0"</span>;
        $back2[<span class="hljs-number">0</span>][<span class="hljs-number">1</span>]= <span 