记录修改的waterMask.js

export 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: 20, // 水印x轴间隔
    watermark_y_space: 10, // 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: 25 // 水印倾斜度数
  }
  if (settings && typeof settings === 'object') {
    var src = settings || {}
    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()
  // 获取页面最大宽度
  var page_width = Math.max(document.body.scrollWidth, document.body.clientWidth)
  var cutWidth = page_width * 0.015
  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
  page_height = Math.max(page_height, window.innerHeight - 30)
  // 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 = 'fixed' // 固定定位，脱离文档流，不占位置
      mask_div.style.left = x + 'px'
      mask_div.style.top = y + 'px'
      mask_div.style.overflow = 'hidden'
      mask_div.style.zIndex = '9999'
      // 让水印不遮挡页面的点击事件
      mask_div.style.pointerEvents = 'none'
      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'
      mask_div.style.userSelect = 'none'
      oTemp.appendChild(mask_div)
    }
  }
  document.body.appendChild(oTemp)
}

export function getNow() {
  var d = new Date()
  var year = d.getFullYear()
  var month = change(d.getMonth() + 1)
  var day = change(d.getDate())
  var hour = change(d.getHours())
  var minute = change(d.getMinutes())
  var second = change(d.getSeconds())

  function change(t) {
    if (t < 10) {
      return '0' + t
    } else {
      return t
    }
  }
  var time = year + '年' + month + '月' + day + '日 ' + hour + '时' + minute + '分' + second + '秒'
  return time
}

export function removeWaterMask() {
  var deleteNodes = Array.from(document.getElementsByClassName('mask_div'))
  deleteNodes.forEach((element) => {
    document.body.removeChild(element)
  })
}