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标题页-学无忧（www.xue51.com）
function ClearForm(form){ //清空页面中的文本框
form.weight.value = "";
form.height.value = "";
form.bmi.value = "";
form.comment.value = "";
}
function bmi(weight, height) {//计算健康值
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){
//判断用户的输入
alert("\n请填写身高和体重！");
return false;
}
else if (parseFloat(form.height.value) =500||
parseFloat(form.weight.value) =500){
alert("\n输入的数据有问题 \n请重新输入.");
//输入数据范围
ClearForm(form);
return false;
}
return true;
}
function computeHealth(form) {
//根据健康值，判断描述信息
if (checkform(form)) {
yourbmi=Math.round(bmi(form.weight.value,
form.height.value/100));
form.bmi.value=yourbmi;
if (yourbmi >30) {
form.comment.value="不要在闹了!!!";
}
else if (yourbmi >28 && yourbmi 23 && yourbmi 21 && yourbmi =19 && yourbmi =18 && yourbmi =17 && yourbmi |