<script src="https://how2j.cn/study/jquery.min.js"></script>
<script>
$(function(){
	$("button").click(function(){
		cacl();
	});
	$("input").keyup(function(){
		cacl();		
	});
});

function cacl(){
	var T_wan = $("#T_wan").val();
	var r0 = $("#r0").val()/100;
	var h1 = $("#h1").val();
	var l1 = $("#l1").val();
	var n0 = $("#n0").val();
	
	var T = T_wan * 10000;
	
	var H = h1 - l1;
	if(H<0)
		H = 0- H;
	
	// N = 0.03*T / (H*n0)
	var N = r0*T/(H*n0);

	$("#H").val(H);
	$("#T").val(T);
	$("#N").val(N);
	
// 	alert()

}

</script>
<style>
table{
 border-collapse:collapse;
}
td{
  border:1px silver solid;
  padding: 5px;
  font-size:12px;
}
input{
  width:80px;
}
div#workingArea{
	width:500px;
        height:600px;
	margin:100px auto;
	text-align:center;
}
</style>
<div id="workingArea">
	<table align="center">
	<tr>
	  <td>总权益(万)</td>
	  <td>T(万)</td>
	  <td><input type="number" id="T_wan" value='20'> ￥</td>
	</tr>
	<tr>
	  <td>总权益</td>
	  <td>T</td>
	  <td><input disabled="disabled" type="number" id="T" value='200000'> ￥</td>
	</tr>
	<tr>
	  <td>总风险度</td>
	  <td>r</td>
	  <td><input disabled="disabled" type="number" id="r" value='3'>%</td>
	</tr>
	<tr>
	  <td>当前品种风险度</td>
	  <td>r0</td>
	  <td><input  type="number" id="r0" value='3'>%</td>
	</tr>
	<tr>
	  <td>开/加仓点位</td>
	  <td>h1</td>
	  <td><input type="number" id="h1" value='110'></td>
	</tr>
	<tr>
	  <td>止损点位</td>
	  <td>l1</td>
	  <td><input type="number" id="l1" value='100'></td>
	</tr>
	<tr>
	  <td>止损幅度</td>
	  <td>H</td>
	  <td><input disabled="disabled" type="number" id="H" value='10'></td>
	</tr>
	<tr>
	  <td>合约数量(1手多少顿)</td>
	  <td>n</td>
	  <td><input type="number" id="n0" value='10'></td>
	</tr>
	<tr>
	  <td colspan="3" style="text-align:center">
	  	<hr style="width:75%;border-color:#f8f8f8">
	  	<button align="center">计算</button>
	  </td>
	</tr>
	<tr>
	  <td>购买手数</td>
	  <td>N</td>
	  <td><input readonly="readonly" type="number" id="N" value='0'></td>
	</tr>
	</table>
</div>