Function d3_timer_replace

d3-3.2.8/d3.js:1941–1947

(callback, delay, then)

    d3_timer_sweep();
  };
  function d3_timer_replace(callback, delay, then) {
    var n = arguments.length;
    if (n < 2) delay = 0;
    if (n < 3) then = Date.now();
    d3_timer_active.callback = callback;
    d3_timer_active.time = then + delay;
  }
  function d3_timer_mark() {
    var now = Date.now();
    d3_timer_active = d3_timer_queueHead;