jquery – Javascript ceil,带有2位小数而不是1位

现在它说：“0.2”,我想说：“0.20”

这是Javascript.任何人都可以告诉我如何实现这一目标？

$(function() {

var valueMultiplier = <?PHP echo $savingsVar; ?>;

function updateamounts() {

    // valueMultiplier = savings
    // value1 = how often do you change your printer cartridges?
    // value2 = how frequently you change them

    var value1 = $('#slider').slider('value');

    var value2 = $('#slidertwo').slider('value');

    var value3 = ((valueMultiplier * value1) * value2);
    var value3 = (Math.ceil(value3 * 10) / 10);

    // add month to it
    if(value1==1){
        value1 = value1 + ' month';
    }else{
        value1 = value1 + ' months';
    }

    value2 = value2 + ' months';

    $('#amount').val(value1);

    $('#amounttwo').val(value2);

    $('#amountthree').val(value1 + value2);

    $('#amountfour').val(value3);

    $('#amountfive').val(value3);

}

$('#slider').slider({value: 1,min: 1,max: 12,step: 1,stop: function(event,ui) {
    updateamounts();
}});
$('#slidertwo').slider({value: 1,min: 3,max: 36,step: 3,ui) {
    updateamounts();
}});

$('#price').val("$" + valueMultiplier);

updateamounts();
});