src/lay/modules/layer.js
function(node, name){
    var style = node.currentStyle ? node.currentStyle : window.getComputedStyle(node, null);
    return style[style.getPropertyValue ? 'getPropertyValue' : 'getAttribute'](name);
  }
function(node, name){
    var style = node.currentStyle ? node.currentStyle : window.getComputedStyle(node, null);
    return style[style.getPropertyValue ? 'getPropertyValue' : 'getAttribute'](name);
  }
获取节点的style属性值