如何用js和css给一个站内所有图片加上水印

发布网友发布时间：2022-04-24 15:55

共3个回答

热心网友时间：2022-04-20 01:11

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<style>
.str {
font: normal bold 5px Arial;
/* font-size: 5px;*/
color: rgb(224, 226, 226,0.4);
position: absolute;
padding-left: 16px;
padding-top: 53px;
display: none;
}

.str2 {
font: normal bold 5px Arial;
/* font-size: 5px; */
color: rgb(224, 226, 226,0.4);
position: absolute;
padding-left: 66px;
padding-top: 130px;
display: none;
}
</style>
</head>
<body>
<div>HOMEANGEL</div>
<div>HOMEANGEL</div>
<img src="https://dss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3252521864,872614242&fm=26&gp=0.jpg" style="width:100px;height:100px;" />
<div id="picture" style="width:100%;margin-left: 60px;">

</div>

<script>
$(function () {
var img = ["https://dss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=3252521864,872614242&fm=26&gp=0.jpg"];
GetCanvas(img);
})
function AddCanvas(src, ById) {
var img = new Image();
img.src = src
img.onload = function () {
imgW = img.width;
imgH = img.height;
//准备canvas环境
var canvas = document.getElementById(ById);
canvas.width = img.width;
canvas.height = img.height;
var ctx = canvas.getContext("2d");
// 绘制图片
ctx.drawImage(img, 0, 0, img.width, img.height);
// 绘制水印
ctx.font = "20px bold Arial";
ctx.fillStyle = "rgb(224, 226, 226,0.6)";//这里是颜色
ctx.fillText("watermark watermark", 20, 60);
ctx.fillText("watermark watermark", 120, 160);
ctx.fillText("watermark watermark", 220, 220);
//ctx.fillText("HOMEANGEL", 90, 130);
canvas.style.width = "100px";
canvas.style.height = "100px";
}
}
function GetCanvas(Strhtml) {
if (Strhtml.length > 0 && Strhtml != "") {
var html = "";
for (var i = 0; i < Strhtml.length; i++) {
var str = "sample" + (i + 1);
html += ' <canvas id=' + str + ' name="test" src=' + Strhtml[i] + ' "></canvas>';
}
$("#picture").html(html);//这里图片添加到html，然后for，添加水印
}
for (var i = 0; i < Strimg.length; i++) {
var str = "sample" + (i + 1);
var src = Strhtml[i];
AddCanvas(src, str);//id没传递
}
}

</script>
</body>

热心网友时间：2022-04-20 02:29

目前前端只有canvas能给图片加水印，但是如果仅仅是加载到页面后用js给图片加水印，那么别人获取到图片地址后，就获取到了没有水印的图片。
所以必须要后端配合。

热心网友时间：2022-04-20 04:04

水印这种东西是防盗图的，你在前端加有什么意义