js实现圆角边框图层显示，这个圆角图层支持背景图片，目前只支持平铺背景图图片，可根据自己的需求自定义。
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<title>支持背景图片的圆角边框图层_武鸣人</title>
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function yj(id){
var obj = document.getElementById(id);
var content = obj.innerHTML;
var s = obj.style;
var width = s.width.replace(/px/gi,"");
var height = s.height.replace(/px/gi,"");
var bc = s.borderColor;
var bg = s.backgroundImage;
var bgc = s.backgroundColor;
var p = s.padding;
var pt = s.paddingTop.replace(/px/gi,"");
var pr = s.paddingRight.replace(/px/gi,"");
var pb = s.paddingBottom.replace(/px/gi,"");
var pl = s.paddingLeft.replace(/px/gi,"");
s.padding = "";
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s.width = "";
s.height = "";
s.border = "";
s.background = "";
bc = (bc == "") ? "#000000" : bc;
if(window.navigator.userAgent.indexOf("Firefox")>=0){
bc = String(bc).toLowerCase().replace(/rgb\(.+?\)/g,function(){return "#"+arguments[0].replace(/(\s|\(|\)|rgb)/g,"").replace(/\d+\,*/g,function(){return parseInt(arguments[0]).toString(16).toLowerCase();});}).substring(0,7);
}
bgc = (bgc == "") ? "none" : bgc;
pt = (pt == "") ? 0 : Math.round(pt);
pr = (pr == "") ? 0 : Math.round(pr);
pb = (pb == "") ? 0 : Math.round(pb);
pl = (pl == "") ? 0 : Math.round(pl);
width = (width == "") ? (20+pl+pr) : Math.round(width)+pl+pr+2;
height = (height == "") ? (20+pt+pb) : Math.round(height)+pt+pb+2;
a1 = "<div style='font:0px;margin:0px;margin-left:5px;width:" + (width-10) + "px;height:1px;background:"+bc+" '></div>";
a2 = "<div style='font:0px;margin:0px;margin-left:3px;width:" + (width-10) + "px;height:1px;background:"+bgc+" "+bg+" -4px 0px;border-left:2px solid "+bc+";border-right:2px solid "+bc+";'></div>";
a3 = "<div style='font:0px;margin:0px;margin-left:2px;width:" + (width-6) + "px;height:1px;background:"+bgc+" "+bg+" -2px -1px;border-left:1px solid "+bc+";border-right:1px solid "+bc+";'></div>";
a4 = "<div style='font:0px;margin:0px;margin-left:1px;width:" + (width-4) + "px;height:2px;background:"+bgc+" "+bg+" -1px -2px;border-left:1px solid "+bc+";border-right:1px solid "+bc+";'></div>";
a5 = "<div style='margin:0px;padding:"+p+";width:" + (width-2-pl-pr) + "px;height:" + (height-10-pt-pb) + "px;background:"+bgc+" "+bg+" 0px -4px;border-left:1px solid "+bc+";border-right:1px solid "+bc+";'>" + content + "</div>";
a6 = "<div style='font:0px;margin:0px;margin-left:1px;width:" + (width-4) + "px;height:2px;background:"+bgc+" "+bg+" -1px -"+(height-2-10+4)+"px;border-left:1px solid "+bc+";border-right:1px solid "+bc+";'></div>";
a7 = "<div style='font:0px;margin:0px;margin-left:2px;width:" + (width-6) + "px;height:1px;background:"+bgc+" "+bg+" -2px -"+(height-2-10+6)+"px;border-left:1px solid "+bc+";border-right:1px solid "+bc+";'></div>";
a8 = "<div style='font:0px;margin:0px;margin-left:3px;width:" + (width-10) + "px;height:1px;background:"+bgc+" "+bg+" -4px -"+(height-2-10+7)+"px;border-left:2px solid "+bc+";border-right:2px solid "+bc+";'></div>";
a9 = "<div style='font:0px;margin:0px;margin-left:5px;width:" + (width-10) + "px;height:1px;background:"+bc+" '></div>";
obj.innerHTML = a1+a2+a3+a4+a5+a6+a7+a8+a9;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
</script>
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