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_width:210,//水印宽度

        watermark_height:80,//水印长度

    };

    //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];

        }

    }

    // 获取需要添加水印的容器

    var box = document.getElementById("box");

   // 创建水印容器 mark-box

    var markBox= document.createElement('div');

     markBox.className="mark-box";

    //获取容器宽度

    var page_width = box.offsetWidth;

    //获取页面最大高度

    var page_height = box.offsetHeight;

    //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.className = 'mask_div';

            mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));

            //给水印定位

            mask_div.style.left = x + 'px';

            mask_div.style.top = y + 'px';

            markBox.appendChild(mask_div);

        };

    };

    box.appendChild(markBox);

}

.mask_div {

    position: absolute;

    overflow: hidden;

    z-index: 9999;

    opacity: 0.2;

    pointer-events: none;

    filter: alpha(opacity=20);

    font-size: 18px;

    font-family: 微软雅黑;

    color: rgb(170, 170, 170);

    text-align: center;

    width: 210px;

    height: 80px;

    display: block;

    -webkit-transform: rotate(-15deg);

    -moz-transform: rotate(-15deg);

    -ms-transform: rotate(-15deg);

    -o-transform: rotate(-15deg);

    transform: rotate(-15deg);

}