Vue 添加当前系统时间和登录人水印，多个tab页面、删除、切换添加当前系统时间和登录人水印

先看效果

html 代码比较复杂，这里只是截图，上面效果是同一个页面两个地方增加水印，

js,在data中定义waterMarkDomFragment:null,waterMarkDomFragment2:null,mask_div_array:[],mask_div_array2:[],currentDbTab:null,

	//最上面的水印
			watermark:function(settings) {
				//默认设置
				var defaultSettings = {
					watermark_txt: "text",
					watermark_x: 10, //水印起始位置x轴坐标
					watermark_y: 10, //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: '#e4e4e4', //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: 20 //水印倾斜度数
				};
				if (arguments.length === 1 && typeof arguments[0] === "object") {
					var src = arguments[0] || {};
					for (var 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();
				var mask_div_array = [];
				//获取页面最大宽度
				var page_width = Math.max(this.$el.scrollWidth, this.$el.clientWidth);
				var cutWidth = page_width * 0.0150;
				var page_width = page_width - cutWidth;
				//获取页面最大高度 this.$el是当前Vue实例的页面，也就是当前页面
				var page_height = Math.max(this.$el.scrollHeight, this.$el.clientHeight) + 450;
				// page_height = Math.max(page_height, window.innerHeight - 30);
				/*//获取页面最大宽度
				var page_width = Math.max(document.body.scrollWidth, document.body.clientWidth);
				var cutWidth = page_width * 0.0150;
				var page_width = page_width - cutWidth;
				//获取页面最大高度
				var page_height = Math.max(document.body.scrollHeight, document.body.clientHeight) + 450;
				page_height = Math.max(page_height, window.innerHeight - 30);*/

				//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));
						//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.lineHeight='25px';
						//让水印不遮挡页面的点击事件
						mask_div.style.pointerEvents = 'none';
						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";
						mask_div_array.push(mask_div);
						oTemp.appendChild(mask_div);
					};
				};
				this.waterMarkDomFragment = oTemp;
				this.mask_div_array = mask_div_array;

				// document.body.appendChild(oTemp);
				// var codemirror=settings.codemirror;
				// codemirror.forEach(function (dbTab,index) {
				// 	console.log('dbTab',settings.codemirror)
				// 	dbTab.appendChild(oTemp);
				// //
				// })

				settings.codemirror.appendChild(oTemp);
			},
                        //最下面的水印
			watermarkTable:function(settings) {
				//默认设置
				var defaultSettings = {

					watermark_txt: "text",
					watermark_x: 10, //水印起始位置x轴坐标
					watermark_y: 10, //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: '#e4e4e4', //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: 20 //水印倾斜度数
				};
				if (arguments.length === 1 && typeof arguments[0] === "object") {
					var src = arguments[0] || {};
					for (var 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();
				var mask_div_array = [];
				//获取页面最大宽度
				var page_width = Math.max(this.$el.scrollWidth, this.$el.clientWidth);
				var cutWidth = page_width * 0.0150;
				var page_width = page_width - cutWidth;
				//获取页面最大高度
				var page_height = Math.max(this.$el.scrollHeight, this.$el.clientHeight) + 450;
				// page_height = Math.max(page_height, window.innerHeight - 30);
				/*//获取页面最大宽度
				var page_width = Math.max(document.body.scrollWidth, document.body.clientWidth);
				var cutWidth = page_width * 0.0150;
				var page_width = page_width - cutWidth;
				//获取页面最大高度
				var page_height = Math.max(document.body.scrollHeight, document.body.clientHeight) + 450;
				page_height = Math.max(page_height, window.innerHeight - 30);*/

				//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));
						//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";
						//让水印不遮挡页面的点击事件
						mask_div.style.pointerEvents = 'none';
						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";
						mask_div_array.push(mask_div);
						oTemp.appendChild(mask_div);
					};
				};
				this.waterMarkDomFragment2 = oTemp;
				this.mask_div_array2 = mask_div_array;

				settings.table.appendChild(oTemp);
			},
	                  //拼接当前系统时间，当前登录人内容--gUserId是系统登录人，根据需要写
			showWaterMark:function (options,tabIndex) {
				//如果原来有水印，删除原有的水印
				if(this.waterMarkDomFragment){
					this.removeWaterMark();
				}
				var now = this.getNow();
				var waterMarkText = gUserId + "\n" + now;
				var defaultOptions = {"watermark_txt":waterMarkText,"watermark_x":70,"watermark_y":60,watermark_fontsize: '22px'};
				var defaultOptions2 = {"watermark_txt":waterMarkText,"watermark_x":10,"watermark_y":80,watermark_fontsize: '22px'};//table
				// var defaultOptions = {"watermark_txt":"数据查询IDE"+now,"watermark_x":70,"watermark_y":120};
				var waterMarkOptions = _.extend({},defaultOptions);
				var waterMarkOptions2 = _.extend({},defaultOptions2);//table
				if(options){
					waterMarkOptions = _.extend(waterMarkOptions,options);
					waterMarkOptions2 = _.extend(waterMarkOptions2,options);//table
				}
				var codemirror='';
				var table='';
                                  //tabActiveIndex 是当前激活的tabindex
				codemirror=$('#codemirror'+this.tabActiveIndex).find('.CodeMirror-scroll')[0];
				table=document.getElementById('table'+this.tabActiveIndex);
				this.watermark( _.extend({},waterMarkOptions,{codemirror:codemirror}));
				this.watermarkTable( _.extend({},waterMarkOptions2,{table:table}));
			},
			removeWaterMark:function () {
				//删除节点
				var self = this;
				if(this.mask_div_array.length > 0){
					this.mask_div_array.forEach(function (mask_div) {

						self.waterMarkDomFragment.appendChild(mask_div);

					});
					this.mask_div_array = [];
				}
				if(this.mask_div_array2.length > 0){
					this.mask_div_array2.forEach(function (mask_div2) {
						self.waterMarkDomFragment2.appendChild(mask_div2);

					});
					this.mask_div_array2 = [];
				}
			},
			handleShowOrRemoveWaterMark:function (currentDbTab,tabIndex) {
				var needWaterMark = false;
				var self=this;
				if(!currentDbTab){
					self.tabData.forEach(function (tabItem) {
							if(tabItem.name == tabIndex){
								needWaterMark = true;
								return true;
							}else{
								needWaterMark = false;
								return true;
							}
						});
				}else{
					needWaterMark = currentDbTab.name==tabIndex?true:false;
				}
				self.renderWaterMark(needWaterMark);
			},      
//渲染水印
renderWaterMark:function (needWaterMark){
      if(this.waterMarkDomFragment){
	this.removeWaterMark();
      }if(needWaterMark){
	this.showWaterMark();
      }
},
//切换每个tab的时候
tabClick:function(tab){
      this.currentDbTab=tab;
},
 //删除tab的时候
removeTab: function(name) {
      var _self = this;
      if(_self.waterMarkDomFragment){
            _self.removeWaterMark();
      }//删除原有的水印
        _.map(this.tabData, function(tab) {
             if (tab.name === name) {
             _self.tabActiveIndex=tab.name;
              _self.currentDbTab=tab;
           });
}

watch:{
            //我这里是监听激活的Index,我这里绑定的tab的标题，也当前激活tab的标题
	tabActiveIndex:{
				handler:function (val) {
					var self = this;
					if(!self.currentDbTab){//新增，删除
						this.handleShowOrRemoveWaterMark(self.currentDbTab?self.currentDbTab:null,self.tabActiveIndex);
					}else{//切换
						this.showWaterMark();
					}

				},
				deep:true
			},
}