// 方法
function watermark(settings) { //水印
//默认设置
var defaultSettings = {
watermarl_element:"body",
watermark_txt:"",
watermark_x:0,//水印起始位置x轴坐标
watermark_y:30,//水印起始位置Y轴坐标
watermark_rows:2000,//水印行数
watermark_cols:2000,//水印列数
watermark_x_space:70,//水印x轴间隔
watermark_y_space:30,//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:210,//水印宽度
watermark_height:80,//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(let 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 maskElement=document.getElementById(defaultSettings.watermarl_element)||document.body;
//获取页面最大宽度
var page_width = Math.max(maskElement.scrollWidth,maskElement.clientWidth);
//获取页面最大高度
var page_height = Math.max(maskElement.scrollHeight,maskElement.clientHeight);
//水印数量自适应元素区域尺寸
defaultSettings.watermark_cols = Math.ceil(page_width/(defaultSettings.watermark_x_space+defaultSettings.watermark_width));
defaultSettings.watermark_rows = Math.ceil(page_height/(defaultSettings.watermark_y_space+defaultSettings.watermark_height)) + 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 - 10) * i;
for (var j = 0; j < defaultSettings.watermark_cols; j++) {
x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;
if(j % 2 != 0){
x += 80;
}
if(j % 3 == 2){
x += 100;
}
// x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space - 40) * 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));
mask_div.innerHTML=(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"; //兼容IE9以下的透明度设置 mask_div.style.filter="alpha(opacity=50)";
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";
if(x < 750){
oTemp.appendChild(mask_div);
}
};
};
maskElement.appendChild(oTemp);
}
// DOM加载之后调用
this.watermark({'watermarl_element': 'water', 'watermark_txt': `水印内容`})
