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通过js给网页加上水印背景

水印方法

export function watermark(settings) {
    //默认设置
    let 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:'#aaa',//水印字体颜色
        watermark_alpha:0.4,//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:210,//水印宽度
        watermark_height:80,//水印长度
        watermark_angle:15//水印倾斜度数
    };

    Object.assign(defaultSettings, settings);

    let oTemp = document.createDocumentFragment();

    //获取页面最大宽度
    let p_width = Math.max(document.body.scrollWidth,document.body.clientWidth);
    let cutWidth = p_width*0.0150;
    let page_width=p_width-cutWidth;
    //获取页面最大高度
    let page_height = Math.max(document.body.scrollHeight,document.body.clientHeight)+450;
    // let page_height = document.body.scrollHeight+document.body.scrollTop;
    //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));
    }
    let x;
    let y;
    for (let i = 0; i < defaultSettings.watermark_rows; i++) {
        y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
        for (let j = 0; j < defaultSettings.watermark_cols; j++) {
            x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;

            let 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));
            //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.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);
}
复制代码

使用方法

import { watermark } from './../common/watermark';
watermark({watermark_txt: '你要添加的水印'});
复制代码

效果演示

ant-admin.gif

源码地址

github.com/artdong/ant…


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