css样式重置 方法一:不推荐使用,这么写会让网页解析速度变慢. *{ margin: 0; padding: 0;} 方法二:大家常用的写法,比较流行. body, html, div, blockquote, img, label, p, h1, h2, h3, h4, h5, h6, pre, ul, ol,li, dl, dt, dd, form, a, fieldset, input, th, td{margin: 0; padding: 0; border: 0; outline:…