后端生成的base64图片，在前端偶尔无法显示

//添加.replace(/=+$/,'') replace(/[\r\n]/g,"")为了解决由于base64图片补码的问题导致的

this.$nextTick(()=>{
        let urlType = '',base64code = ''
        if(type.toUpperCase()==='PDF'){
          urlType = `data:application/pdf;base64`
          base64code = this.generalOrderDetailImgPreview
        }else{
          urlType = `data:image/${type};base64`
          base64code = this.generalOrderDetailImgPreview.replace(/[\r\n]/g,"")
        }
        this.imageUrl = `${urlType},${this.generalOrderDetailImgPreview}`
        
      })