CSS重置

　　在css文件的顶部一般会看到下面的样式

　　*  {

　　　　margin: 0;
　　　　padding: 0;
　　}

　　这里的星号代表所有元素，意思是把所有元素的 margin 和 padding 都重置为 0

　　之所以要这么做，是因为要清除浏览器默认的样式，这种做法简单，粗暴，但不推荐

　　所以慢慢就衍生出了 reset.css

　　一般常用的 reset.css 有 5 种，详见：https://www.cnblogs.com/humin/p/3515547.html

　　

　　我选择的是上面链接的第一种：Eric Meyer’s “Reset CSS” 2.0

　　

/** * Eric Meyer's Reset CSS v2.0 (http://meyerweb.com/eric/tools/css/reset/) * http://cssreset.com */

html,
body,
div,
span,
applet,
object,
iframe,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
a,
abbr,
acronym,
address,
big,
cite,
code,
del,
dfn,
em,
img,
ins,
kbd,
q,
s,
samp,
small,
strike,
strong,
sub,
sup,
tt,
var,
b,
u,
i,
center,
dl,
dt,
dd,
ol,
ul,
li,
fieldset,
form,
label,
legend,
table,
caption,
tbody,
tfoot,
thead,
tr,
th,
td,
article,
aside,
canvas,
details,
embed,
figure,
figcaption,
footer,
header,
hgroup,
menu,
nav,
output,
ruby,
section,
summary,
time,
mark,
audio,
video {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
}


/* HTML5 display-role reset for older browsers */

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
    display: block;
}

body {
    line-height: 1;
}

ol,
ul {
    list-style: none;
}

blockquote,
q {
    quotes: none;
}

blockquote:before,
blockquote:after,
q:before,
q:after {
    content: '';
    content: none;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}

　　

　　然后我根据自己的需要适当做了一些调整

　　①：删除了这3个属性

　　　　font-size: 100%;

　　　　font: inherit;

　　　　vertical-align: baseline;

　　②：增加了2个属性

　　　　outline：0;

　　　　text-decoration: none;

　　　　text-decoration: underline;

　　③：上面 reset.css 没有给 input和button元素重置margin,padding,outline为0

/** * Eric Meyer's Reset CSS v2.0 (http://meyerweb.com/eric/tools/css/reset/) * http://cssreset.com */


/* css重置——去除浏览器默认样式 */

a,
abbr,
acronym,
address,
applet,
article,
aside,
audio,
b,
big,
blockquote,
body,
canvas,
caption,
center,
cite,
code,
dd,
del,
details,
dfn,
div,
dl,
dt,
em,
embed,
fieldset,
figcaption,
figure,
footer,
form,
h1,
h2,
h3,
h4,
h5,
h6,
header,
hgroup,
html,
i,
iframe,
img,
ins,
kbd,
label,
legend,
li,
mark,
menu,
nav,
object,
ol,
output,
p,
pre,
q,
ruby,
s,
samp,
section,
small,
span,
strike,
strong,
sub,
summary,
sup,
table,
tbody,
td,
tfoot,
th,
thead,
time,
tr,
tt,
u,
ul,
var,
video,
input,
button {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
}

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
    display: block;
}

body {
    line-height: 1;
}

ol,
ul {
    list-style: none;
}

blockquote,
q {
    quotes: none;
}

blockquote:after,
blockquote:before,
q:after,
q:before {
    content: '';
    content: none;
}

table {
    border-collapse: collapse;
    border-spacing: 0;
}

a {
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}