jsm-mall-front/src/utils/print.js

// 打印类属性、方法定义
/* eslint-disable */
const Print = function (dom, options) {
  if (!(this instanceof Print)) return new Print(dom, options)

  this.options = this.extend(
    {
      noPrint: '.no-print'
    },
    options
  )

  if (typeof dom === 'string') {
    this.dom = document.querySelector(dom)
  } else {
    this.isDOM(dom)
    this.dom = this.isDOM(dom) ? dom : dom.$el
  }

  this.init()
}
Print.prototype = {
  init: function () {
    var content = this.getStyle() + this.getHtml()
    this.writeIframe(content)
  },
  extend: function (obj, obj2) {
    for (var k in obj2) {
      obj[k] = obj2[k]
    }
    return obj
  },

  getStyle: function () {
    var str = '',
      styles = document.querySelectorAll('style,link')
    for (var i = 0; i < styles.length; i++) {
      str += styles?.[i]?.outerHTML || ''
    }
    str += '<style>' + (this.options.noPrint ? this.options.noPrint : '.no-print') + '{display:none;}</style>'

    return str
  },

  getHtml: function () {
    var inputs = document.querySelectorAll('input')
    var textareas = document.querySelectorAll('textarea')
    var selects = document.querySelectorAll('select')

    for (var k = 0; k < inputs.length; k++) {
      if (inputs[k].type == 'checkbox' || inputs[k].type == 'radio') {
        if (inputs[k].checked == true) {
          inputs[k].setAttribute('checked', 'checked')
        } else {
          inputs[k].removeAttribute('checked')
        }
      } else if (inputs[k].type == 'text') {
        inputs[k].setAttribute('value', inputs[k].value)
      } else {
        inputs[k].setAttribute('value', inputs[k].value)
      }
    }

    for (var k2 = 0; k2 < textareas.length; k2++) {
      if (textareas[k2].type == 'textarea') {
        textareas[k2].innerHTML = textareas[k2].value
      }
    }

    for (var k3 = 0; k3 < selects.length; k3++) {
      if (selects[k3].type == 'select-one') {
        var child = selects[k3].children
        for (var i in child) {
          if (child[i].tagName == 'OPTION') {
            if (child[i].selected == true) {
              child[i].setAttribute('selected', 'selected')
            } else {
              child[i].removeAttribute('selected')
            }
          }
        }
      }
    }
    // 包裹要打印的元素
    // fix: https://github.com/xyl66/vuePlugs_printjs/issues/36
    let outerHTML = this.wrapperRefDom(this.dom).outerHTML
    return outerHTML
  },
  // 向父级元素循环，包裹当前需要打印的元素
  // 防止根级别开头的 css 选择器不生效
  wrapperRefDom: function (refDom) {
    let prevDom = null
    let currDom = refDom
    // 判断当前元素是否在 body 中，不在文档中则直接返回该节点
    if (!this.isInBody(currDom)) return currDom

    while (currDom) {
      if (prevDom) {
        let element = currDom.cloneNode(false)
        element.appendChild(prevDom)
        prevDom = element
      } else {
        prevDom = currDom.cloneNode(true)
      }

      currDom = currDom.parentElement
    }

    return prevDom
  },

  writeIframe: function (content) {
    var w,
      doc,
      iframe = document.createElement('iframe'),
      f = document.body.appendChild(iframe)
    iframe.id = 'myIframe'
    //iframe.style = "position:absolute;width:0;height:0;top:-10px;left:-10px;";
    iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;')
    w = f.contentWindow || f.contentDocument
    doc = f.contentDocument || f.contentWindow.document
    doc.open()
    doc.write(content)
    doc.close()
    var _this = this
    iframe.onload = function () {
      _this.toPrint(w)
      setTimeout(function () {
        document.body.removeChild(iframe)
      }, 100)
    }
  },

  toPrint: function (frameWindow) {
    try {
      setTimeout(function () {
        frameWindow.focus()
        try {
          if (!frameWindow.document.execCommand('print', false, null)) {
            frameWindow.print()
          }
        } catch (e) {
          frameWindow.print()
        }
        frameWindow.close()
      }, 10)
    } catch (err) {
      console.log('err', err)
    }
  },
  // 检查一个元素是否是 body 元素的后代元素且非 body 元素本身
  isInBody: function (node) {
    return node === document.body ? false : document.body.contains(node)
  },
  isDOM:
    typeof HTMLElement === 'object'
      ? function (obj) {
          return obj instanceof HTMLElement
        }
      : function (obj) {
          return obj && typeof obj === 'object' && obj.nodeType === 1 && typeof obj.nodeName === 'string'
        }
}
const MyPlugin = {}
MyPlugin.install = function (Vue, options) {
  // 4. 添加实例方法
  Vue.prototype.$print = Print
}
export default MyPlugin