html网页局部刷新
怎么使html网页局部自动刷新id=\"test\"的内容,使用异步方法刷新要求代码尽量简洁,因为有内存限制。
"<html><head>\n\
<meta name='viewport' content='width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no'/>\n\
<title></title><style type='text/css'>\n\
a{color:black;text-decoration:none}nav{display:-webkit-box;-webkit-box-orient:horizontal;-webkit-box-pack:justify}\n\
.nav a{display:block}.mod{text-align:center;padding:10px 0;border-top:1px solid #EBEBEB}.mod .tab{margin:auto;width:300px}\n\
</style>
</head>
<body id=\"test\" style='margin:0;padding:0'>\n\
<div style='background:#168DFD;text-align:center;line-height:45px'><span style='color: #fff'>APF %s-%d</span></div>\n\
<div style='padding:10px 12px 10px 12px'><nav class='nav'><a href='#' style='color:#168DFD'>基本</a><a href='power.htm'>功率</a><a href='io.htm'>I/O</a><a href='setting.htm'>设置</a><a href='about.htm'>关于</a></nav></div>\n\
<div class='mod'>
<table class='tab'>
<tr><th colspan='4'>电网电压</th></tr>
<tr><td width='50%%'>有效值(V)</td><td>%.1f</td><td>%.1f</td><td>%.1f</td></tr><
tr><td>频率(Hz)</td><td>%.1f</td><td>%.1f</td><td>%.1f</td></tr>
<tr><td>THDU(%)</td><td>%.1f</td><td>%.1f</td><td>%.1f</td></tr></table></div>\n\
<div class='mod'>
<table class='tab'>
<tr><th colspan='4'>电网电流</th></tr>
<tr><td width='50%%'>有效值(A)</td><td>%.1f</td><td>%.1f</td><td>%.1f</td></tr>
<tr><td>功率因数</td><td>%.2f</td><td>%.2f</td><td>%.2f</td></tr>
<tr><td>THDI(%)</td><td>%.1f</td><td>%.1f</td><td>%.1f</td></tr></table></div>\n\
</body></html>"