<script type="text/javascript">
var weight=prompt("请输入你体重(公斤)~");
var height=prompt("请输入你的身高(米)~");
getLast(weight,height);
function getLast(weight,height){
setTimeout(function(){
var last=weight/(height*height);
function getOkValue(last){
var weightOk;
var heightOk;
if(last <18){
weightOk=18*height*height;
heightOk=Math.sqrt(weight/18) ;
}else if(last>25){
weightOk=25*height*height;
weightOk=weight/25;
}
return "休重应增加"+(weightOk-weight)+"kg,或身高"+(heightOk-height)+"m方可回到正常值。"
}
if(last>=18 && last<=25){
alert("BMI值是"+last+",正常~");
}else if(last<18){
alert("BMI值是"+last+","+getOkValue(last)+"偏瘦呢，亲~");
}else if(last>25){
alert("BMI值是"+last+","+getOkValue(last)+"偏胖呢，亲~");
}
},1000);
}
</script>
