判断小数点位数不超过2位的JS代码和在删除确认框里面插JS代码

<script type="text/javascript">
    function checkDecimals(){
        var decallowed = 2;
        var revValue = document.getElementById("rev").value;
        if(revValue.indexOf('.') == -1){
            revValue += ".";
        }
        var dectext = revValue.substring(revValue.indexOf('.')+1, revValue.length);
        if(dectext.length > decallowed){
            alert ("careful!,don't write more than " + decallowed + " decimal. please try again!");
            document.getElementById("rev").focus();
            return false;
        }else{
            return true;
        }
    }
</script>

 上面是JS的代码，下面是html的代码：

<input type="submit" onclick="JavaScript:if(confirm('Are your sure to save it?')){return checkDecimals();}else{return false;}" value="save" />

解释上面的代码：

(1)本来调用的是delete的JS代码：它原本应该这样写

<input type="submit" onclick="JavaScript:if(confirm('Are your sure to save it?')){return true;}else{return false;}"  value="save" />

(2)但是现在要加判断里面输入框的验证，本来验证是这样写

<input type="submit" onclick="return checkDecimals();"  value="save" />

    现在要把这两个代码合并起来用，所以在delete的JS代码里面就不能返回return true;了，要改成return checkDecimals(); 这样就可以解决上面的问题了。