function watermark(settings) {

	  //預設設定
	  var defaultSettings={
	    watermark_txt:"text",
	    watermark_x:20,//水印起始位置x軸座標
	    watermark_y:20,//水印起始位置Y軸座標
	    watermark_rows:20,//水印行數
	    watermark_cols:20,//水印列數
	    watermark_x_space:100,//水印x軸間隔
	    watermark_y_space:50,//水印y軸間隔
	    watermark_color:'#aaa',//水印字型顏色
	    watermark_alpha:0.3,//水印透明度
	    watermark_fontsize:'18px',//水印字型大小
	    watermark_font:'微軟雅黑',//水印字型
	    watermark_width:120,//水印寬度
	    watermark_height:80,//水印長度
	    watermark_angle:15//水印傾斜度數
	  };
	  //採用配置項替換預設值，作用類似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();

	  //獲取頁面最大寬度
	  var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth);
	  //獲取頁面最大長度
	  var page_height = Math.max(document.body.scrollHeight,document.body.clientHeight);

	  //如果將水印列數設定為0，或水印列數設定過大，超過頁面最大寬度，則重新計算水印列數和水印x軸間隔
	  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));
	  }
	  //如果將水印行數設定為0，或水印行數設定過大，超過頁面最大長度，則重新計算水印行數和水印y軸間隔
	  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));
	      //設定水印div傾斜顯示
	      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.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);
	}