js通过MutationObserver监测实现防删文字水印效果代码-html代码-BFW代码库

js通过MutationObserver监测实现防删文字水印效果代码

代码语言：html

所属分类：其他

代码描述：js通过MutationObserver监测实现防删文字水印效果代码，水印内容不可删除，如检测到被删除，会重新添加水印

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<html>
    <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
   
</head>
<body>
<div id="content" style="padding:10px;">
<h2>防删文字水印</h2>
水印内容不可删除，如检测到被删除，会重新添加水印
</div>
<script>
    function add_water_canvas(){
        //水印canvas
        var water_canvas = document.createElement("canvas");
        water_canvas.id = "water_canvas";
        water_canvas.height = 100;
        water_canvas.width = 300;
        water_canvas.style.top = 100 + "px";
        water_canvas.style.left = 100 + "px";
        water_canvas.style.position = "absolute";
        water_canvas.style.transform = "rotate(-45deg)";
        //水印内容
        var water_text = water_canvas.getContext("2d");
        water_text.font = "26px 黑体";
        water_text.fillText("水印内容", 30, 50);
        //canvas容器：水印目标
        var canvas_container = document.getElementById("content");
        canvas_container.style.height =  280 + "px";
        canvas_container.style.width = 500 + "px";
        canvas_c.........完整代码请登录后点击上方下载按钮下载查看