检测健康程度

下面框中为脚本显示区

脚本说明：
把如下代码加入<body>区域中:
<script LANGUAGE="JAVASCRIPT">

<!-- hide this script tag's contents from old browsers

function ClearForm(form){

form.weight.value = "";

form.height.value = "";

form.bmi.value = "";

form.my_comment.value = "";

}

function bmi(weight, height) {

bmindx=weight/eval(height*height);

return bmindx;

}

function checkform(form) {

if (form.weight.value==null||form.weight.value.length==0

|| form.height.value==null||form.height.value.length==0){

alert("\nPlease complete the form first");

return false;

}

else if (parseFloat(form.height.value) <= 0||

parseFloat(form.height.value) >=500||

parseFloat(form.weight.value) <= 0||

parseFloat(form.weight.value) >=500){

alert("\nReally know what you're doing? \nPlease enter values again. \nWeight in kilos and \nheight in cm");

ClearForm(form);

return false;

}

return true;

}

function computeform(form) {

if (checkform(form)) {

yourbmi=Math.round(bmi(form.weight.value, form.height.value/100));

form.bmi.value=yourbmi;

if (yourbmi >30) {

form.my_comment.value="不要在闹了!!!";

}

else if (yourbmi >28 && yourbmi <=30) {

form.my_comment.value="您是猪吗?";

}

else if (yourbmi >23 && yourbmi <=28) {

form.my_comment.value="两头猪也没有你重吧?";

}

else if (yourbmi >21 && yourbmi <=23) {

form.my_comment.value="您现在是偏胖,应该注意饮食!";

}

else if (yourbmi >=19 && yourbmi <=21) {

form.my_comment.value="哇!!!您太苗条了! 是标准身材";

}

else if (yourbmi >=18 && yourbmi <19) {

form.my_comment.value="您是不是营养不良?????";

}

else if (yourbmi >=17 && yourbmi <18) {

form.my_comment.value="这个不是骨头吗????";

}

else if (yourbmi <17) {

form.my_comment.value="按照生物学来说这种生物是不能生存的";

}

return;

}

// -- done hiding from old browsers -->

</script>

<form NAME="BMI" method="POST">
  <table border="1">
    <tr>
      <td><font color="red"><div align="center"><center><p>体重</font> (kg)</td>
      <td align="center"><font color="red"><div align="center"><center><p>身高</font>(cm)</td>
      <td align="center"><font color="blue"><div align="center"><center><p>健康值</font></td>
      <td align="center"><font color="blue"><div align="center"><center><p>电脑对您的评价</font></td>
    </tr>
    <tr align="center">
      <td><input TYPE="TEXT" NAME="weight" SIZE="6" onFocus="this.form.weight.value=''"></td>
      <td><input TYPE="TEXT" NAME="height" SIZE="6" onFocus="this.form.height.value=''"></td>
      <td><input TYPE="TEXT" NAME="bmi" SIZE="5"></td>
      <td><input TYPE="TEXT" NAME="my_comment" size="40"></td>
    </tr>
  </table>
  <div align="center"><center><p><input TYPE="button" VALUE="确定"
  onClick="computeform(this.form)"> <input TYPE="reset" VALUE="取消"
  onClick="ClearForm(this.form)"> </p>
  </center></div>
</form>