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vue 实现背景图水印不可删除

木匠0819 02-28 16:00 阅读 2

原理:利用MutationObserver监听父节点的子节点变化,如果变化,重新创建水印节点并添加到父节点中

代码如下:

 createWaterMark(){
      var parent = document.querySelector('#imageDom')
      var waterMarkBg = document.createElement('view')
      waterMarkBg.className = 'waterMarkBg'
      waterMarkBg.style.width = '100%'
      waterMarkBg.style.height = '100%'
      waterMarkBg.style.position = 'absolute'
      waterMarkBg.style.backgroundImage = `url(${this.watermarkUrl})`
      waterMarkBg.style.top = '0'
      waterMarkBg.style.right = '0'
      waterMarkBg.style.backgroundSize = '140px 140px'
      waterMarkBg.style.zIndex = '-1'
      parent.appendChild(waterMarkBg)
    },
    //水印监听器
    waterMarkBgObserver(){
      this.moObserver = new MutationObserver(()=>{
        var waterMarkBgDom = document.querySelector('.waterMarkBg')
        if(!waterMarkBgDom){
          this.createWaterMark()
        }
        
      })
      let config = { attributes: true,subtree: true,childList: true };
      this.moObserver.observe(document.querySelector('#imageDom'),config)
    },
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