めも

shot.js

var page = require('webpage').create(),
    system = require('system');

var url = system.args[1];

page.viewportSize = {
	width : system.args[2] || 1024,
	height: system.args[3] || 768
};

// @see https://github.com/ariya/phantomjs/issues/10619#issuecomment-24516046
function renderCurrentViewport(page, filename) {
  var viewportSize = page.viewportSize;
  var scrollOffsets = page.evaluate(function() {
    return {
      x: window.pageXOffset,
      y: window.pageYOffset
    };
  });
  page.clipRect = {
    top: scrollOffsets.y,
    left: scrollOffsets.x,
    height: viewportSize.height,
    width: viewportSize.width
  };
  page.render(filename);
}

page.open(url, function () {
  renderCurrentViewport(this, './shot/'+url.replace(/\//g, '-')+'.png');
  phantom.exit();
});