var mask_div = document.createElement(‘div‘);    mask_div.id = ‘mask_div1‘;    mask_div.appendChild(document.createTextNode("test"));    mask_div.style.position = "absolute";    mask_div.style.left =  ‘20px‘;    mask_div.style.top =  ‘20px‘;    mask_div.style.overflow = "hidden";    mask_div.style.zIndex = "9999";    mask_div.style.opacity = 0.3;document.body.appendChild(mask_div);

/** * Created with JetBrains PhpStorm. * User: ronniegong * Date: 14-11-4 * Time: 下午6:02 * To change this template use File | Settings | File Templates. */function watermark(settings) {    //默认设置    var defaultSettings={        watermark_txt:"text",        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:20,//水印行数        watermark_cols:20,//水印列数        watermark_x_space:100,//水印x轴间隔        watermark_y_space:50,//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:‘18px‘,//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=http://www.mamicode.com/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();    //获取页面最大宽度    var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth);    //获取页面最大长度    var page_height = 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 = "9999";            //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);        };    };    document.body.appendChild(oTemp);}

watermark({ watermark_txt: "测试水印" })//传入动态水印内容//onload时触发水印绘制window.onload=function(){watermark({ watermark_txt: "测试水印" });};//onresize时触发水印绘制window.onresize = function () { watermark({ watermark_txt: "测试水印",watermark_width:50 }) };