在此之前,我们会有这样的想法:(1)...class=‘class 1’>...‘class=’class 1‘>...’class=‘class 1’>...‘>...’class=‘class 3’>...‘>...’class=‘class 2’>...‘>...’>...‘class=’class 1‘>...’class=‘class 1’>...‘class=’class 1‘class 1’class=‘class 1’>...‘class=’class 1‘>...’class=‘class 1’>...‘class=’class 3‘>...’class=‘class 3’>...‘class=’class 2‘>...’class=‘class 2’>...‘class=’class 1‘class 1’class 2‘class 1...’>...‘class=’class 2‘>...’class=‘class 2’>...