使用JS给页面添加水印效果

灰太狼 2023-06-25 06:18 7阅读 0赞

原文：[https://www.cnblogs.com/Miracle-ZLZ/p/9340249.html][https_www.cnblogs.com_Miracle-ZLZ_p_9340249.html]

此方法可以给整个页面或某个div添加水印效果。

**1、普通使用方式：**

$(document).ready(function() {
            var watermark_txt = "测试效果" + getDate();
            watermark({"watermarl_element":"watermark-wrapper", "watermark_txt":watermark_txt});  
    });

**注**：watermark-wrapper是div的id名称。

**2、如果项目中有ajax请求，等待所有ajax请求结束后再去加载，这样可以避免div存在滚动条时水印显示不全 **

$(document).ready(function() {
            var watermark_txt = "测试效果" + getDate();
            $.when($.ajax(), $.ajax()).then(function(){
                watermark({"watermarl_element":"watermark-wrapper", "watermark_txt":watermark_txt});
            });
        });

3、效果图：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3R5cDE4MDU_size_16_color_FFFFFF_t_70][]** 4、代码**

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>页面添加水印</title>
        <script src="js/jquery.js"></script>
        <style>
            .watermark-wrapper{
                height: 1000px;
            }
        </style>
    </head>
    <body>
    <div id="watermark-wrapper" class="watermark-wrapper">
        
    </div>
    
    </body>
    <script>
    
        $(document).ready(function() {
           var watermark_txt = "测试效果" + getDate();
           watermark({"watermarl_element":"watermark-wrapper", "watermark_txt":watermark_txt});
        });
    
        function watermark(settings) {
            //默认设置
            var defaultSettings={
                watermarl_element:"body",
                watermark_txt:"",
                watermark_x:10,//水印起始位置x轴坐标
                watermark_y:10,//水印起始位置Y轴坐标
                watermark_rows:2000,//水印行数
                watermark_cols:2000,//水印列数
                watermark_x_space:50,//水印x轴间隔
                watermark_y_space:50,//水印y轴间隔
                watermark_color:'#d7d7d7',//水印字体颜色
                watermark_alpha:0.5,//水印透明度
                watermark_fontsize:'15px',//水印字体大小
                watermark_font:'微软雅黑',//水印字体
                watermark_width:500,//水印宽度
                watermark_height:50,//水印长度
                watermark_angle:15//水印倾斜度数
            };
            //采用配置项替换默认值，作用类似jquery.extend
            if(arguments.length===1&&typeof arguments[0] ==="object" ) {
                var src=arguments[0]||{};
                for(key in src) {
                    if(src[key]&&defaultSettings[key]&&src[key]===defaultSettings[key]){
                        continue;
                    } else if(src[key]){
                        defaultSettings[key]=src[key];
                    }
                }
            }
    
            var oTemp = document.createDocumentFragment();
    
            var maskElement=document.getElementById(defaultSettings.watermarl_element) || document.body;
            //获取页面最大宽度
            var page_width = Math.max(maskElement.scrollWidth,maskElement.clientWidth);
            //获取页面最大高度
            var page_height = Math.max(maskElement.scrollHeight,maskElement.clientHeight,maskElement.scrollTop);
            //水印数量自适应元素区域尺寸
            defaultSettings.watermark_cols=Math.ceil(page_width/(defaultSettings.watermark_x_space+defaultSettings.watermark_width));
            defaultSettings.watermark_rows=Math.ceil(page_height/(defaultSettings.watermark_y_space+defaultSettings.watermark_height));
            var x;
            var y;
            for (var i = 0; i < defaultSettings.watermark_rows; i++) {
                y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
                for (var j = 0; j < defaultSettings.watermark_cols; j++) {
                    x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;
                    var mask_div = document.createElement('div');
                    mask_div.id = 'mask_div' + i + j;
                    mask_div.className = 'mask_div';
                    //mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
                    mask_div.innerHTML=(defaultSettings.watermark_txt);
                    //设置水印div倾斜显示
                    mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                    mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                    mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                    mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                    mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
                    mask_div.style.visibility = "";
                    mask_div.style.position = "absolute";
                    mask_div.style.left = x + 'px';
                    mask_div.style.top = y + 'px';
                    mask_div.style.overflow = "hidden";
                    mask_div.style.zIndex = "1029"; // 9999
                    // pointer-events:none  让水印不遮挡页面的点击事件
                    mask_div.style.pointerEvents='none';
                    // 设置边框
                    // mask_div.style.border="solid #eee 1px";
                    // 兼容IE9以下的透明度设置
                    mask_div.style.filter="alpha(opacity=50)";
                    mask_div.style.opacity = defaultSettings.watermark_alpha;
                    mask_div.style.fontSize = defaultSettings.watermark_fontsize;
                    mask_div.style.fontFamily = defaultSettings.watermark_font;
                    mask_div.style.color = defaultSettings.watermark_color;
                    mask_div.style.textAlign = "center";
                    mask_div.style.width = defaultSettings.watermark_width + 'px';
                    mask_div.style.height = defaultSettings.watermark_height + 'px';
                    mask_div.style.display = "block";
                    oTemp.appendChild(mask_div);
                };
            };
            maskElement.appendChild(oTemp);
        }
    
        function getDate() {
            var d = new Date();
            var year = d.getFullYear() >= 10 ? d.getFullYear() : ('0'+d.getFullYear());
            var month = d.getMonth()+1 >= 10 ? d.getMonth()+1 : ('0'+d.getMonth()+1);
            var day = d.getDate() >= 10 ? d.getDate() : ('0'+d.getDate());
            var hour = d.getHours() >= 10 ? d.getHours() : ('0'+d.getHours());
            var minute = d.getMinutes() >= 10 ? d.getMinutes() : ('0'+d.getMinutes());
            var second = d.getSeconds() >= 10 ? d.getSeconds() : ('0'+d.getSeconds());
            return year+"-"+month+"-"+day+" "+hour+":"+minute+":"+second;
        }
    
    </script>
    </html>

[https_www.cnblogs.com_Miracle-ZLZ_p_9340249.html]: https://www.cnblogs.com/Miracle-ZLZ/p/9340249.html
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