jq图片加水印
需求：扫码跳转页面，后台返回base64图片，需要图片加水印禁止下载
实现：使用watermark.js。css禁用手机点击图片，整页加水印
(function(watermark){ window.watermarkdivs = []; // 加载水印 var loadMark = function(settings) { var defaultSettings={ watermark_txt:"text", watermark_x:10,//水印起始位置x轴坐标 watermark_y:10,//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:50,//水印x轴间隔 watermark_y_space:20,//水印y轴间隔 watermark_color:'#000000',//水印字体颜色 watermark_alpha:0.5,//水印透明度，要求设置在大于等于0.005 watermark_fontsize:'18px',//水印字体大小 watermark_font:'微软雅黑',//水印字体 watermark_width:100,//水印宽度 watermark_height:50,//水印长度 watermark_angle:15,//水印倾斜度数 watermark_bg_alpha:0.5 //加透明度导致隐形水印无法读取 }; //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]; } } if (window.watermarkdivs && window.watermarkdivs.length > 0) { document.body.removeChild(document.getElementById("otdivid")); window.watermarkdivs = []; } //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("otdivid"); if(!otdiv){ otdiv =document.createElement('div'); otdiv.id="otdivid"; otdiv.style.pointerEvents = "none"; document.body.appendChild(otdiv); } //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); // 设置一张水印相关属性start mask_div.id = 'mask_div' + 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"; //设置一张水印相关属性end //附加到文档碎片中 otdiv.appendChild(mask_div); window.watermarkdivs.push(otdiv); //控制页面大小变化时水印字体 }; }; //一次性添加到document中 document.body.appendChild(oTemp); }; watermark.load = function(settings) { window.onload = function() { loadMark(settings); }; window.onresize = function() { loadMark(settings); }; }; })(window.watermark = {});
<script type="text/javascript"> watermark.load({ watermark_txt: "仅供预览！" }); $(function () { var id=getUrlParam('id') initData(id) }) function initData(id){ var baseUrl=window.baseUrl $.ajax({ type:'GET', url:baseUrl+'', success:function (res) { if(res.code==200){ $('#content img').scr(res.data.base64Url) } }, error:function(){ alert('获取数据失败！') } }) } //获取url中的参数 function getUrlParam(name) { var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)"); //构造一个含有目标参数的正则表达式对象 var r = window.location.search.substr(1).match(reg); //匹配目标参数 if (r != null) return unescape(r[2]); return null; //返回参数值 } </script>
效果图：
