让一个元素消失和出现的方法是什么
display:none;和display:block;
opacity:0;和opacity:1;(可以结合transition:1s;,做过渡动画)
visibility:visible;和visibility:hidden;
display:none;和display:block;
opacity:0;和opacity:1;(可以结合transition:1s;,做过渡动画)
visibility:visible;和visibility:hidden;