Change label color using Javascript

Hello All,

I am working on an application.I have developed frontend using Xml now i want to change the label color on click of button can any1 please help me with this.

i tried the code

onclick : fuction()

{

var l = this.getView().byId("lbl");

document.getElementById("l").setColor = 'Blue';

}

but its not working please help me with this.

Thanks in advance