<!-- 把如下代码加入<body>区域中 -->
<form name="bandwidth">
<p><input type="text" name="original" size="20" value=1024> <select size="1" name="units">
<option value="Bytes">Bytes</option>
<option value="Kb">Kb</option>
<option value="Mb">Mb</option>
<option value="Gb">Gb</option>
</select> <input type="button" value="详细计算" name="B1" onClick="calculate()"></p>
</form>
<script>
var bytevalue=0
function calculate(){
var invalue=document.bandwidth.original.value
var selectunit=document.bandwidth.units.options[document.bandwidth.units.selectedIndex].value
if (selectunit=="Bytes")
bytevalue=invalue
else if (selectunit=="Kb")
bytevalue=invalue*1024
else if (selectunit=="Mb")
bytevalue=invalue*1024*1024
else if (selectunit=="Gb")
bytevalue=invalue*1024*1024*1024
alert (invalue+" "+selectunit+" 等于:\n\n- "+bytevalue+" Bytes\n- "+Math.round(bytevalue/1024)+" Kb\n- "+Math.round(bytevalue/1024/1024)+" Mb\n- "+Math.round(bytevalue/1024/1024/1024)+" Gb\n")
}
</script>
