function checkspace(checkstr) { var str = ''; for(i = 0; i < checkstr.length; i++) { str = str + ' '; } return (str == checkstr); } function ForDight(Dight,How) { Dight = Math.round(Dight*Math.pow(10,How))/Math.pow(10,How); return Dight; } function cal(){ if(checkspace(document.form1.Height.value)){ alert("对不起，身高不能为空！"); document.form1.Height.focus(); return false; } if(isNaN(document.form1.Height.value)){ alert("对不起，身高必须是数字！"); document.form1.Height.focus(); return false; } if(document.form1.Height.value*1<0){ alert("对不起，身高不能小于0！"); document.form1.Height.focus(); return false; } if(checkspace(document.form1.Weight.value)){ alert("对不起，孕前体重不能为空！"); document.form1.Weight.focus(); return false; } if(isNaN(document.form1.Weight.value)){ alert("对不起，孕前体重必须是数字！"); document.form1.Weight.focus(); return false; } if(document.form1.Weight.value*1<0){ alert("对不起，孕前体重不能小于0！"); document.form1.Weight.focus(); return false; } var reg1=0,reg2=0,reg3=0,reg4=0; vHeight = document.form1.Height.value*1; vWeight = document.form1.Weight.value*1; reg1 = ForDight((vHeight*vHeight)*21/10000,2); reg2 = ForDight((vWeight-reg1)/reg1*100,2); reg3 = ForDight((vWeight/(vHeight*vHeight))*10000,2); reg4 = ForDight((reg3*0.88+6.65)*(vHeight*vHeight)/10000,2); document.all("xiaowazi1").innerText = reg1; document.all("xiaowazi2").innerText = reg2; document.all("xiaowazi3").innerText = reg3; document.all("xiaowazi4").innerText = reg4; return false; }

您的身高： 厘米(cm)

孕前体重： 公斤(kg)

测试结果

孕前标准体重:0公斤
孕前肥胖度:0%
肥胖度BMI值:0
怀孕时理想体重:0公斤