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通过js给网页加上水印背景

lyingzhu 2021年4月27日 2022年9月9日

HTML代码：

<pre class="inline:true class:language-html decode:1 " >&lt;div id="water-div" style="pointer-events: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;"&gt; &lt;/div&gt;
&lt;script type="text/javascript" &gt;
            function watermark(txt) {
                //初始设置水印容器高度                
                var water = document.getElementById("water-div");
                water.innerHTML = "";
               
                //水印样式默认设置
                var defaultSettings={
                    watermark_txt:txt,
                    watermark_x:20,//水印起始位置x轴坐标
                    watermark_y:20,//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:30,//水印y轴间隔
                    watermark_color:'#aaaaaa',//水印字体颜色
                    watermark_alpha:0.3,//水印透明度
                    watermark_fontsize:'18px',//水印字体大小
                    watermark_font:'微软雅黑',//水印字体
                    watermark_width:280,//水印宽度
                    watermark_height:80,//水印高度
                    watermark_angle: 15//水印倾斜度数

                };
 
                //获取页面最大宽度
                var page_width = Math.max(document.documentElement.clientWidth, window.screen.availWidth);
                //获取页面最大高度
                var page_height = Math.max(document.documentElement.clientHeight, window.screen.availHeight);
                
 
                //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 &lt; defaultSettings.watermark_rows; i++) {
                    y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
                    for (var j = 0; j &lt; 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 = "9999";
                        mask_div.style.pointerEvents='none';//pointer-events:none 让水印不遮挡页面的点击事件
                        //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";                        
                        water.appendChild(mask_div);
                        //document.getElementById("content").appendChild(mask_div);
                    }
                }
            }

            function getCurrentDate(format) {
                var now = new Date();
                var year = now.getFullYear(); //得到年份
                var month = now.getMonth();//得到月份
                var date = now.getDate();//得到日期
                var day = now.getDay();//得到周几
                var hour = now.getHours();//得到小时
                var minu = now.getMinutes();//得到分钟
                var sec = now.getSeconds();//得到秒
                month = month + 1;
                if (month &lt; 10) month = "0" + month;
                if (date &lt; 10) date = "0" + date;
                if (hour &lt; 10) hour = "0" + hour;
                if (minu &lt; 10) minu = "0" + minu;
                if (sec &lt; 10) sec = "0" + sec;
                var time = "";
                //精确到天
                if (format == 1) {
                    time = year + "-" + month + "-" + date;
                }
                    //精确到分
                else if (format == 2) {
                    time = year + "-" + month + "-" + date + " " + hour + ":" + minu + ":" + sec;
                }
                return time;
            }
        &lt;/script&gt;

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function watermark(txt) {

//初始设置水印容器高度

var water = document.getElementById("water-div");

water.innerHTML = "";

//水印样式默认设置

var defaultSettings={

watermark_txt:txt,

watermark_x:20,//水印起始位置x轴坐标

watermark_y:20,//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:30,//水印y轴间隔

watermark_color:'#aaaaaa',//水印字体颜色

watermark_alpha:0.3,//水印透明度

watermark_fontsize:'18px',//水印字体大小

watermark_font:'微软雅黑',//水印字体

watermark_width:280,//水印宽度

watermark_height:80,//水印高度

watermark_angle: 15//水印倾斜度数

};

//获取页面最大宽度

var page_width = Math.max(document.documentElement.clientWidth, window.screen.availWidth);

//获取页面最大高度

var page_height = Math.max(document.documentElement.clientHeight, window.screen.availHeight);

//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 = "9999";

mask_div.style.pointerEvents='none';//pointer-events:none 让水印不遮挡页面的点击事件

//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";

water.appendChild(mask_div);

//document.getElementById("content").appendChild(mask_div);

}

function getCurrentDate(format) {

var now = new Date();

var year = now.getFullYear(); //得到年份

var month = now.getMonth();//得到月份

var date = now.getDate();//得到日期

var day = now.getDay();//得到周几

var hour = now.getHours();//得到小时

var minu = now.getMinutes();//得到分钟

var sec = now.getSeconds();//得到秒

month = month + 1;

if (month < 10) month = "0" + month;

if (date < 10) date = "0" + date;

if (hour < 10) hour = "0" + hour;

if (minu < 10) minu = "0" + minu;

if (sec < 10) sec = "0" + sec;

var time = "";

//精确到天

if (format == 1) {

time = year + "-" + month + "-" + date;

}

//精确到分

else if (format == 2) {

time = year + "-" + month + "-" + date + " " + hour + ":" + minu + ":" + sec;

}

return time;

}

</script>

调用：

效果如图：