D3js怎么获得SVG及其子元素在屏幕中的坐标

var clientRects = svg.select("image").node().getBoundingClientRect();
 
var coordinates = [
  [clientRects.left, clientRects.top],
  [clientRects.top, clientRects.right],
  [clientRects.bottom, clientRects.left],
  [clientRects.bottom, clientRects.right]
];