how to change hintText color in textField Titanium?

this is my code,and I want to change the hintText Color, how to do?

    "#email":{
    width: '70%',
    left:'13%',
    font:{
        fontSize:'20sp'
    },
    color: '#fff',
    hintText:'请输入手机号',
    borderColor:'transparent',
    bottom:'2%',
    //backgroundColor:'#d9d9d9',
    backgroundColor:'transparent',
    borderStyle:Ti.UI.INPUT_BORDERSTYLE_ROUNDED
}

actually you can't i tried before
here what i did to change the hint color and font
you need to create a view, textfeild and label with adding change listener on textfeild to show or hide the hint

 var mh_view = Ti.UI.createView({
    backgroundColor : "white",
    height : "40dp",
    top : "224dp",
    left : "10dp",
    right : "10dp",
    width : Ti.UI.FILL
});
var mail_hint = Ti.UI.createLabel({
    color : "#88817F",
    font : {
        fontFamily : customfont2,
        fontSize : "15dp"
    },
    left : "47dp",
    //top:"14dp",
    text : "E-mail"
});
mh_view.add(mail_hint);
var mail = Ti.UI.createTextField({
    backgroundImage : "/images/trans.png",
    width : Ti.UI.FILL,
    height : "40dp",
    top : "224dp",
    left : "10dp",
    right : "10dp",
    bubbleParent:false,
    paddingLeft : "47dp"
    // hintText:"E-mail"
});

var visible = true;
mail.addEventListener("change", function() {
    if (visible) {
        mail_hint.hide();
    } else {
        if ((mail.value).length == 0)
            mail_hint.show();
    }
    visible = !visible;

});

hope it help :)