为何IMG设置了useMap之后就出现了蓝边
//Hotspot div
this.hs_map = document.createElement("map");
this.hs_map.id = 'hs_map';
this.hs_map.name = 'hs_map';
this.hs_img = document.createElement("img");
this.hs_img.id = 'hs_img';
this.hs_img.name = 'hs_img';
this.hs_img.src = "image/hotspot.gif";
this.hs_img.useMap = '#hs_map';
this.hs_img.style.position = 'absolute';
this.hs_img.style.top = '0px';
this.hs_img.style.left = '0px';
this.hs_img.style.zindex = '1';
this.hs_img.onmousedown = null;
其中使用this.hs_img.useMap = '#hs_map'之后就使得图片左边和上边出现了蓝边,注释这句就没有,而map又没有相应的style,不知为何加上这个之后IMG的style就发生变化了.有熟悉的朋友请指教,谢谢!