网页添加水印

 1 function addWaterMarker(str){ 2 ?3 ?4 ????var can = document.createElement(‘canvas‘); 5 ????var body = document.body; 6 ?7 ????body.appendChild(can); 8 ?9 ????can.width=400;10 ????can.height=200;11 ????can.style.display=‘none‘;12 13 14 ????var cans = can.getContext(‘2d‘);15 ????cans.rotate(-20*Math.PI/180);16 ????cans.font = "16px Microsoft JhengHei";17 ????cans.fillStyle = "rgba(17, 17, 17, 0.50)";18 ????cans.textAlign = ‘left‘;19 ????cans.textBaseline = ‘Middle‘;20 ????cans.fillText(str,can.width/3,can.height/2);21 22 ????body.style.backgroundImage="url("+can.toDataURL("image/png")+")";23 24 }