Js实现动态添加水印

来源：互联网发布：龙芯支持linux 编辑：程序博客网时间：2024/06/03 10:55
今天有一个新需求,因为数据比较敏感需要在查询后表格中添加水印,在网上搜到一个js大牛写的解决方案,在他的基础上我做了些优化,先将源码公布出来便于学习。代码在Chrome-52.0.2743.116上测试过没有问题。
<html><title>表格动态水印</title><head>    <meta charset="UTF-8">    <script>  function watermark(settings) {    //默认设置    var defaultSettings={        watermark_objName:"t1",        watermark_txt:"text",        watermark_x:-10,//水印起始位置x轴坐标        watermark_y:40,//水印起始位置Y轴坐标        watermark_rows:20,//水印行数        watermark_cols:40,//水印列数        watermark_x_space:0,//水印x轴间隔        watermark_y_space:0,//水印y轴间隔        watermark_color:'#000000',//水印字体颜色        watermark_alpha:0.3,//水印透明度        watermark_fontsize:'20px',//水印字体大小        watermark_font:'微软雅黑',//水印字体        watermark_width:120,//水印宽度        watermark_height:80,//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 obj=document.getElementById(defaultSettings.watermark_objName);    var oTemp = document.createDocumentFragment();    //获取页面最大宽度    var page_width =obj.offsetWidth; //Math.max(document.body.scrollWidth,document.body.clientWidth);    //获取页面最大长度    var page_height = obj.offsetHeight ;//Math.max(document.body.scrollHeight,document.body.clientHeight);    //如果将水印列数设置为0，或水印列数设置过大，超过页面最大宽度，则重新计算水印列数和水印x轴间隔    if (defaultSettings.watermark_cols == 0 || (parseInt(defaultSettings.watermark_x + defaultSettings.watermark_width *defaultSettings.watermark_cols + defaultSettings.watermark_x_space * (defaultSettings.watermark_cols - 1)) > page_width)) {        defaultSettings.watermark_cols = parseInt((page_width-defaultSettings.watermark_x+defaultSettings.watermark_x_space) / (defaultSettings.watermark_width + defaultSettings.watermark_x_space));        defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x - defaultSettings.watermark_width * defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));    }    //如果将水印行数设置为0，或水印行数设置过大，超过页面最大长度，则重新计算水印行数和水印y轴间隔    if (defaultSettings.watermark_rows == 0 || (parseInt(defaultSettings.watermark_y + defaultSettings.watermark_height * defaultSettings.watermark_rows + defaultSettings.watermark_y_space * (defaultSettings.watermark_rows - 1)) > page_height)) {        defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height - defaultSettings.watermark_y) / (defaultSettings.watermark_height + defaultSettings.watermark_y_space));        defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) - defaultSettings.watermark_height * defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));    }    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.appendChild(document.createTextNode(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 = "-1";            //mask_div.style.border="solid #eee 1px";            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);        };    };    //将水印添加到容器中    obj.appendChild(oTemp);}//传入动态水印内容</script></head><body><input type="button" name="" value="11111" onclick="watermark({watermark_txt:'Text',watermark_objName:'table1'})"/><div id="table1"  style="width:550px; height:500px;" >    <table  width="500" height="500" border="">        <tr><td>1</td><td><input type="button" name="" value="可以点击的按钮"></td></tr>        <tr><td>1</td><td>2</td></tr>        <tr><td>1</td><td>2</td></tr>        <tr><td>1</td><td>2</td></tr>    </table></div></body></html>
由于是在别人的代码上修改过的,现将来源附于下面,尊重他人的劳动成果。
http://www.tuicool.com/articles/YRZ3uq
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