95 lines
5.4 KiB
JavaScript
95 lines
5.4 KiB
JavaScript
function watermark(settings) {
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//默认设置
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var defaultSettings = {
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watermark_txt: "text",
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watermark_x: 70,//水印起始位置x轴坐标
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watermark_y: 70,//水印起始位置Y轴坐标
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watermark_rows: 0,//水印行数
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watermark_cols: 1,//水印列数
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watermark_x_space: 60,//水印x轴间隔
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watermark_y_space: 50,//水印y轴间隔
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watermark_color: '#000000',//水印字体颜色
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watermark_alpha: 0.2,//水印透明度
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watermark_fontsize: '22px',//水印字体大小
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watermark_font: '微软雅黑',//水印字体
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watermark_width: 100,//水印宽度
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watermark_height: 60,//水印长度
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watermark_angle: 20,//水印倾斜度数
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watermark_page_width: "",
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watermark_page_height: ""
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};
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//采用配置项替换默认值，作用类似jquery.extend
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if (arguments.length === 1 && typeof arguments[0] === "object") {
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var src = arguments[0] || {};
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for (key in src) {
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if (src[key] && defaultSettings[key] && src[key] === defaultSettings[key])
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continue;
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else if (src[key])
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defaultSettings[key] = src[key];
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}
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}
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var oTemp = document.createDocumentFragment();
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//获取页面最大宽度
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var page_width = Math.max(document.body.scrollWidth, document.body.clientWidth);
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//获取页面最大长度
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var page_height = Math.max(document.body.scrollHeight, document.body.clientHeight);
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if (defaultSettings.watermark_page_width) {
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page_width = defaultSettings.watermark_page_width;
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}
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if (defaultSettings.watermark_page_height) {
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page_height = defaultSettings.watermark_page_height;
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}
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//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
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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)) {
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defaultSettings.watermark_cols = parseInt((page_width - defaultSettings.watermark_x + defaultSettings.watermark_x_space) / (defaultSettings.watermark_width + defaultSettings.watermark_x_space));
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defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x - defaultSettings.watermark_width * defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));
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}
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//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
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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)) {
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defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height - defaultSettings.watermark_y) / (defaultSettings.watermark_height + defaultSettings.watermark_y_space));
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defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) - defaultSettings.watermark_height * defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));
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}
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var x;
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var y;
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for (var i = 0; i < defaultSettings.watermark_rows; i++) {
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if (isNaN(defaultSettings.watermark_y_space)) { defaultSettings.watermark_y_space = 50; }
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y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
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for (var j = 0; j < defaultSettings.watermark_cols; j++) {
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x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;
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var mask_div = document.createElement('div');
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mask_div.id = 'mask_div' + i + j;
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mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
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//设置水印div倾斜显示
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mask_div.style.webkitTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
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mask_div.style.MozTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
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mask_div.style.msTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
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mask_div.style.OTransform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
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mask_div.style.transform = "rotate(-" + defaultSettings.watermark_angle + "deg)";
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mask_div.style.visibility = "";
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mask_div.style.position = "absolute";
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mask_div.style.left = x + 'px';
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mask_div.style.top = y + 'px';
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mask_div.style.overflow = "hidden";
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mask_div.style.zIndex = "9999";
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//mask_div.style.border="solid #eee 1px";
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mask_div.style.opacity = defaultSettings.watermark_alpha;
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mask_div.style.fontSize = defaultSettings.watermark_fontsize;
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mask_div.style.fontFamily = defaultSettings.watermark_font;
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mask_div.style.color = defaultSettings.watermark_color;
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mask_div.style.textAlign = "center";
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mask_div.style.width = defaultSettings.watermark_width + 'px';
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mask_div.style.height = defaultSettings.watermark_height + 'px';
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mask_div.style.display = "block";
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oTemp.appendChild(mask_div);
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};
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};
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document.body.appendChild(oTemp);
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} |