function echo(stringA, stringB) {
var hello="你好";
alert("hello world")
}/*! normalize.css v7.0.0 | MIT License | github.com/necolas/normalize.css */
html {
	line-height: 1.15;
	-ms-text-size-adjust: 100%;
	-webkit-text-size-adjust: 100%
}
body {
	margin: 0
}
article, aside, footer, header, nav, section {
	display: block
}
h1 {
	font-size: 2em;
	margin: .67em 0
}
figcaption, figure, main {
	display: block
}
figure {
	margin: 1em 40px
}
hr {
	box-sizing: content-box;
	height: 0;
	overflow: visible
}
pre {
	font-family: monospace, monospace;
	font-size: 1em
}
a {
	background-color: transparent;
	-webkit-text-decoration-skip: objects
}
abbr[title] {
	border-bottom: 0;
	text-decoration: underline;
	text-decoration: underline dotted
}
b, strong {
	font-weight: inherit
}
b, strong {
	font-weight: bolder
}
code, kbd, samp {
	font-family: monospace, monospace;
	font-size: 1em
}
dfn {
	font-style: italic
}
mark {
	background-color: #ff0;
	color: #000
}
small {
	font-size: 80%
}
sub, sup {
	font-size: 75%;
	line-height: 0;
	position: relative;
	vertical-align: baseline
}
sub {
	bottom: -0.25em
}
sup {
	top: -0.5em
}
audio, video {
	display: inline-block
}
audio:not([controls]) {
	display: none;
	height: 0
}
img {
	border-style: none
}
svg:not(:root) {
	overflow: hidden
}
button, input, optgroup, select, textarea {
	font-family: sans-serif;
	font-size: 100%;
	line-height: 1.15;
	margin: 0
}
button, input {
	overflow: visible
}
button, select {
	text-transform: none
}
button, html [type="button"], [type="reset"], [type="submit"] {
-webkit-appearance:button
}
button::-moz-focus-inner, [type="button"]::-moz-focus-inner, [type="reset"]::-moz-focus-inner, [type="submit"]::-moz-focus-inner {
border-style:none;
padding:0
}
button:-moz-focusring, [type="button"]:-moz-focusring, [type="reset"]:-moz-focusring, [type="submit"]:-moz-focusring {
outline:1px dotted ButtonText
}
fieldset {
	padding: .35em .75em .625em
}
legend {
	box-sizing: border-box;
	color: inherit;
	display: table;
	max-width: 100%;
	padding: 0;
	white-space: normal
}
progress {
	display: inline-block;
	vertical-align: baseline
}
textarea {
	overflow: auto
}
[type="checkbox"], [type="radio"] {
box-sizing:border-box;
padding:0
}
[type="number"]::-webkit-inner-spin-button, [type="number"]::-webkit-outer-spin-button {
height:auto
}
[type="search"] {
-webkit-appearance:textfield;
outline-offset:-2px
}
[type="search"]::-webkit-search-cancel-button, [type="search"]::-webkit-search-decoration {
-webkit-appearance:none
}
::-webkit-file-upload-button {
-webkit-appearance:button;
font:inherit
}
details, menu {
	display: block
}
summary {
	display: list-item
}
canvas {
	display: inline-block
}
template {
	display: none
}
[hidden] {
display:none
}