function selCalcType_onchange() {
    var calcType = getValueById("selCalcType");
    if (calcType == 0) {
        document.getElementById("spanA").innerHTML = "年利率";
        document.getElementById("spanB").innerHTML = "日利率";
        document.getElementById("spanC").innerHTML = "月利率";
    }
    else if (calcType == 1) {
        document.getElementById("spanA").innerHTML = "月利率";
        document.getElementById("spanB").innerHTML = "日利率";
        document.getElementById("spanC").innerHTML = "年利率";
    }
    else {
        document.getElementById("spanA").innerHTML = "日利率";
        document.getElementById("spanB").innerHTML = "月利率";
        document.getElementById("spanC").innerHTML = "年利率";
    }
}

function getValueById(elementId) {
    return document.getElementById(elementId).value;
}

var calc=function(){
    var calcType = getValueById("selCalcType");

    var val = $('#txtA').val();
    if(!isIntNum(val)){
      toastr.warning("输入有误");
      return false;
    }

    var _numA=$('#txtA').val()/100;
    var numB = 0;
    var numC = 0;
    if (calcType == 0) {
        numB = _numA / 360;
        numC = _numA / 12;
    }
    else if (calcType == 1) {
        numB = _numA / 30;
        numC = _numA * 12;
    }
    else {
        numB = _numA * 30;
        numC = _numA * 360;
    }
    $("#txtB").val(FormatRate(numB));
    $("#txtC").val(FormatRate(numC));
    toastr.success("计算成功");
}

function FormatRate(rate) {
    rate = rate * 100;
    var str = rate.toFixed(4);
    str = (str.substring(str.length - 1) == '0') ? str.substring(0, str.length - 1) : str
    str = (str.substring(str.length - 1) == '0') ? str.substring(0, str.length - 1) : str
    str = (str.substring(str.length - 1) == '0') ? str.substring(0, str.length - 1) : str
    str = (str.substring(str.length - 1) == '0') ? str.substring(0, str.length - 1) : str
    str = (str.substring(str.length - 1) == '.') ? str.substring(0, str.length - 1) : str
    return str;
}

function isIntNum(val){
    var regPos = /^\d+$/; // 非负整数
    var regNeg = /^\-[1-9][0-9]*$/; // 负整数
    if(regPos.test(Number(val)) || regNeg.test(Number(val))){
        return true;
    }else{
        return false;
    }
}