計算BMI工具

體重過輕 (Under weight)	BMI < 18.5
體重正常 (Normal weight)	18.5 ≤ BMI <24
體重過重 (Over weight)	24 ≤ BMI < 27
輕度肥胖 (Mildly obese)	27 ≤ BMI < 30
中度肥胖 (Moderately obese)	30 ≤ BMI < 35
重度肥胖 (Severe obesity)	35 ≤ BMI

Height (cm):
Weight (kg):



後記：
雖然是很簡單的程式，不過因為需要用所以隨手寫了下，畢竟最近體重被盯很緊...( 艸)

原始碼：

<table>
<tr><td>體重過輕 (Under weight)</td><td>BMI &lt; 18.5</td></tr>
<tr><td>體重正常 (Normal weight)</td><td>18.5 &le; BMI &lt;24</td></tr>
<tr><td>體重過重 (Over weight)</td><td>24 &le; BMI &lt; 27</td></tr>
<tr><td>輕度肥胖 (Mildly obese)</td><td>27 &le; BMI &lt; 30</td></tr>
<tr><td>中度肥胖 (Moderately obese)</td><td>30 &le; BMI &lt; 35</td></tr>
<tr><td>重度肥胖 (Severe obesity)</td><td>35 &le; BMI</td></tr>
</table>
<br />
Height (cm): <input type="text" id="hhboxy" /><br />
Weight (kg): <input type="text" id="whboxy" /><br />
<button id="countboxy">Count</button><br />
<span id="bmiboxy"></span>
<script type="text/javascript">
var bmiboxy = new function() {
    return {
        json : {
              0 : "體重過輕 (Under weight)",
            185 : "體重正常 (Normal weight)",
            240 : "體重過重 (Over weight)",
            270 : "輕度肥胖 (Mildly obese)",
            300 : "中度肥胖 (Moderately obese)",
            350 : "重度肥胖 (Severe obesity)"
        },
        count : function() {
            var height = document.getElementById('hhboxy').value;
            var weight = document.getElementById('whboxy').value;
            var bmi = weight/Math.pow(height/100 ,2);
            for(var key in this.json)
                if(bmi >= (key/10))
                    var explain = this.json[key];
            document.getElementById('bmiboxy').innerHTML = "BMI=" + bmi.toPrecision(5) + ", " + explain;
        }
    };
};
document.getElementById('countboxy').onclick = function() {
    bmiboxy.count();
};
</script>