​

​

function colorize() {

  document.body.style.color = this.color;

}

​

var redColor = {

  color: 'red'

};

​

var blueColor = {

  color: 'blue'

};

​

var redf = colorize.bind(redColor);

var bluef = colorize.bind(blueColor);

​

​

document.getElementById('red').onclick = redf;

document.getElementById('blue').onclick = bluef;

​