console 命令行工具 X clear

console


function  km_to_others(){
    var y=document.getElementById("num").value
  document.getElementById("num1").value = y*1000;
  document.getElementById("num2").value = y*100000;
  document.getElementById("num3").value = y*1000000;
}

/* meter to others */
function  m_to_others(){
    var x=document.getElementById("num1").value
  document.getElementById("num").value = x*0.001;
  document.getElementById("num2").value = x*100;
  document.getElementById("num3").value = x*1000;
}

/* centimeter to others */
function lm_to_others(){
    var a=document.getElementById("num2").value
  document.getElementById("num").value = a*0.00001.toFixed(5);
  document.getElementById("num1").value = a*0.01.toFixed(5);
  document.getElementById("num3").value = a*10;
}

/* millimeter to others */
function hm_to_others(){
    var b=document.getElementById("num3").value
  document.getElementById("num").value = b*0.000001.toFixed(6);
  document.getElementById("num1").value = b*0.001.toFixed(6);
  document.getElementById("num2").value = b*0.1.toFixed(6);
}



function  cut(){
    var x=document.getElementsByTagName("input")
    var i;
   for(i=0;i<x.length;i++){
  x[i].value=""
 }
}

<html>
<head><title>单位转换</title></head>
<body>
    <div style="margin-left:300px;" >
	<h2>长度转换单位</h2>
  <button  onclick="cut()">清空</button>
  <br/>  
   <span>千米:</span>
   <input type="number"  id="num" onchange="km_to_others()" >
   <br/>
    <span>&nbsp;&nbsp米:</span>
   <input type="number"  id="num1" onchange="m_to_others()" >
    <br/>
     <span>厘米:</span>
   <input type="number"  id="num2"  onchange="lm_to_others()" >
    <br/>
 <span>毫米:</span>
   <input type="number"  id="num3"  onchange="hm_to_others()">
    <br/>

</div>

</body>

</html>