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/H5+JS+CSS3實(shí)現(xiàn)七夕言情

//?計(jì)算移動(dòng)距離
function?calculateDist(direction,?proportion)?{?
???return?(direction?==?"x"??????????visualWidth?:?visualHeight)?*?proportion;
???}
???里面的倆個(gè)參數(shù)是什么意思呢？看不懂，為什么要?*?proportion;