文本水印

    打开控制台，copy如下代码：

(function addWaterMarker(str){
var can = document.createElement('canvas');
var body = document.body;
body.appendChild(can);
can.width=250;
can.height=250;
can.style.display='none';
var cans = can.getContext('2d');
cans.rotate(-20*Math.PI/200);
cans.font = "16px";
cans.fillStyle = "rgba(0,0,0,0.5)";
cans.textAlign = 'left';
cans.textBaseline = 'Middle';
cans.fillText(str,can.width/3,can.height/2);
body.style.backgroundImage="url("+can.toDataURL("image/png")+")";
}
)('BES DataCool');

 

临时给网页增加水印