Generating a hue spectrum.

color_strip.js

var hue, cell,
    grades = 100,
    query = '';

for (var i = 0; i < grades; i++) {
  hue = i * 360 / grades
  query = '<div style="float:left;' + 
          'width:' + (100/grades) + '%;' + 
          'height:20px;' + 
          'background-color: hsl(' + hue + ', 100%, 75%);"></div>'
  cell = $(query)
  $('body').append(cell);
}