一、watermark.js水印的实现
简单明了直接上代码哈！！！
function watermark(settings) {
//默认设置
var defaultSettings = {
watermarl_element: "body",
watermark_txt: "",
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: 2000, //水印行数
watermark_cols: 2000, //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: '#B0B0B0', //水印字体颜色
watermark_alpha: 0.2, //水印透明度
watermark_fontsize: '14px', //水印字体大小
watermark_font: '常规体', //水印字体
watermark_width: 250, //水印宽度
watermark_height: 50, //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 (typeof settings === "object") {
var src = settings || {};
for (var i = 0; i < Object.keys(settings).length; i++) {
if (src[Object.keys(settings)[i]] && defaultSettings[Object.keys(settings)[i]] && src[Object.keys(settings)[i]] === defaultSettings[Object.keys(settings)[i]]) {
continue;
} else if (src[Object.keys(settings)[i]]) {
defaultSettings[Object.keys(settings)[i]] = src[Object.keys(settings)[i]];
}
}
}
var oTemp = document.createDocumentFragment();
var maskElement = document.getElementById(defaultSettings.watermarl_element) || document.body;
//获取页面最大宽度
var page_width = Math.max(maskElement.scrollWidth, maskElement.clientWidth);
//获取页面最大高度
var page_height = Math.max(maskElement.scrollHeight, maskElement.clientHeight, maskElement.scrollTop);
//水印数量自适应元素区域尺寸
// //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));
// }
defaultSettings.watermark_cols = Math.ceil(page_width / (defaultSettings.watermark_x_space + defaultSettings.watermark_width));
defaultSettings.watermark_rows = Math.ceil(page_height / (defaultSettings.watermark_y_space + defaultSettings.watermark_height));
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.innerHTML = (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";
// 判断列奇偶
if (j % 2 > 0) {
mask_div.style.top = y + 50 + 'px';
mask_div.style.left = x + 'px';
} else {
mask_div.style.top = y + 'px';
mask_div.style.left = x + 'px';
}
// 判断行奇偶
if (i % 2 > 0) {
mask_div.style.top = y -15 + 'px';
mask_div.style.left = x + 160 + 'px';
} else {
mask_div.style.top = y + 20 + 'px';
mask_div.style.left = x +20+ 'px';
}
mask_div.style.overflow = "hidden";
mask_div.style.letterSpacing = "1px";
// mask_div.style.zIndex = "1029"; // 9999
mask_div.style.zIndex = "1999"; // 9999
// pointer-events:none 让水印不遮挡页面的点击事件
mask_div.style.pointerEvents = 'none';
// 兼容IE9以下的透明度设置
mask_div.style.filter = "alpha(opacity=20)";
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.width = defaultSettings.watermark_width + 'px';
mask_div.style.height = defaultSettings.watermark_height + 'px';
mask_div.style.display = "flex";
mask_div.style.textAlign = "center";
mask_div.style.alignItems = "center";
mask_div.style.position = "fixed";
mask_div.style.zIndex = "9999";
// mask_div.style.overflow = 'hidden'
oTemp.appendChild(mask_div);
};
};
maskElement.appendChild(oTemp);
}
export default watermark
二、引入js文件
- 在入口文件引入watermark.js，且入口div上加上类名
import Watermark from "@/common/watermark";
<template>
<div class="with-watermark">
</div>
</template>
- 画水印方法
// 画水印
handleWaterMark() {
let start = window.location.href.lastIndexOf("/");
let allpath = window.location.href.slice(start + 1);
let path = allpath.split("?")[0];
if (path === "login") {
var watermark_txt = "";
this.removeWatermark();
Watermark({
watermark_element: "with-watermark",
watermark_txt: " ",
});
} else {
this.removeWatermark();
var watermark_txt = "水印文案";
Watermark({
watermark_element: "with-watermark",
watermark_txt: watermark_txt,
});
}
},
- 移除水印方法
// 移除水印
removeWatermark() {
let att = document.getElementsByClassName("mask_div");
for (let index in att) {
if (att[index] !== null && att[index].id) {
att[index].style.display = "none";
}
}
},
- 在updated生命周期中调用画水印的方法，即可实现存在错位且倾斜的水印
