js添加背景水印

<!DOCTYPE html>

<head>

<title>Document</title>

<style>

#userName {

width: 350px;

height: 100px;

}

</style>

</head>

<body>

如果需要全部都添加水印，建议用这个盒子包裹起来

</div>

function watermark(settings) {

//默认设置

var 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: 180,//水印宽度

watermark_height: 100,//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 (arguments.length === 1 && typeof arguments[0] === "object") {

var src = arguments[0] || {};

for (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();

//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;

// var 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));

}

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.pointerEvents = 'none';//pointer-events:none 让水印不遮挡页面的点击事件

//mask_div.style.border="solid #eee 1px";

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);

}

var userName = $('#userName').val()

watermark({ watermark_txt: '要添加到背景水印的内容' + userName })

</script>

</body>

</html>

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