通过js给网页加上水印背景实例

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);
}

使用方法

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

效果演示

源码地址

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