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watermark 水印
```javascript
function checkWaterStatus(domain){
var otdiv = document.getElementById('joychou');
if(!otdiv) {
watermark.load({watermark_txt: domain})
watermark.load({watermark_txt: domain, watermark_x:100, watermark_y:100, watermark_alpha: 0.01})
}
}
// 定时器
setInterval(checkWaterStatus, 100, "JoyChou's Blog")
(function(watermark){
window.watermarkdivs = [];
// 加载水印
var loadMark = function(settings) {
var defaultSettings={
watermark_id: 'joychou', //水印总体的id
watermark_txt:"测试水印", //水印的内容
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:0, //水印行数
watermark_cols:0, //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_font:'微软雅黑', //水印字体
watermark_color:'black', //水印字体颜色
watermark_fontsize:'20px', //水印字体大小
watermark_alpha:0.07, //水印透明度,要求设置在大于等于0.003
watermark_width:150, //水印宽度
watermark_height:100, //水印长度
watermark_angle:25, //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];
}
}
//如果元素存在就移除
// var watermark_element = document.getElementById(defaultSettings.watermark_id);
// if(watermark_element){
// var _parentElement = watermark_element.parentNode;
// if(_parentElement){
// _parentElement.removeChild(watermark_element);
// }
// }
//获取页面最大宽度
var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth);
//获取页面最大长度
var page_height = Math.max(document.body.scrollHeight,document.body.clientHeight);
// 创建文档碎片
var oTemp = document.createDocumentFragment();
//创建水印外壳div
var otdiv = document.getElementById(defaultSettings.watermark_id);
if(!otdiv){
otdiv = document.createElement('div');
//创建shadow dom
otdiv.id = defaultSettings.watermark_id;
otdiv.style.pointerEvents = "none";
//判断浏览器是否支持createShadowRoot方法
if(typeof otdiv.createShadowRoot === 'function'){
shadowRoot = otdiv.createShadowRoot();
}else{
shadowRoot = otdiv;
}
//将shadow dom随机插入到body内的任意位置
var nodeList = document.body.children;
var index = Math.floor(Math.random()*(nodeList.length-1));
if(nodeList[index]){
document.body.insertBefore(otdiv,nodeList[index]);
}else{
document.body.appendChild(otdiv);
}
}else if(otdiv,shadowRoot){
shadowRoot = otdiv.shadowRoot;
}
//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');
var oText=document.createTextNode(defaultSettings.watermark_txt);
mask_div.appendChild(oText);
// 设置水印相关属性start
mask_div.id = defaultSettings.watermark_id + i + j;
//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";
//选不中
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.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";
//设置水印相关属性end
//附加到文档碎片中
shadowRoot.appendChild(mask_div);
};
};
};
//初始化水印,添加load和resize事件
watermark.init = function(settings) {
window.addEventListener('load',function () {
loadMark(settings);
});
window.addEventListener('resize',function () {
loadMark(settings);
});
window.addEventListener('DOMContentLoaded',function () {
loadMark(settings);
})
};
//手动加载水印
watermark.load = function(settings){
loadMark(settings);
};
})(window.watermark = {} );
```
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