function watermark(settings) {
		//水印间距
		var spacing='1.5';
		var alpha='0.5';
		//默认设置
		let defaultSettings = {
			watermark_txt : "text",
			watermark_x : 20,//水印起始位置x轴坐标
			watermark_y :70,//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 : 0,//水印x轴间隔
			watermark_y_space : 20,//水印y轴间隔
			watermark_color : '#aaa',//水印字体颜色
			watermark_alpha : alpha,//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*spacing,//水印宽度 
			watermark_height : 80*spacing,//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)+ defaultSettings.watermark_width;
		let cutWidth = p_width * 0.0150;
		let page_width = p_width - cutWidth;
		//获取页面最大高度
		let page_height =   $(window).height() -40+ defaultSettings.watermark_height;
		// 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 = "fixed";
				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);
			}
		}
		$('body').append(oTemp);
	}