解决vue-print插件打印时表格宽度无法撑满自适应

最近帮同事解决一个前端页面布局问题，技术背景vue+elementui，出现问题如下：点击详情表格布局一切正常（列数不固定，估计后端返回决定）点击打印之后的表格出现不能撑满，多出空白列的情况。

 未点击打印时布局展示

 经过各种调试主要解决由：tableLayout属性用来显示表格单元格、行、列的算法规则

①auto：（默认值）列宽度由单元格内容设定；

 ②fixed: 列宽由表格宽度和列宽度设定；

 ③inherit：规定应该从父元素继承table-layout属性的值。

/设置表格布局算法*/
 table{
     table-layout:auto!important;
}

和重新给elementui的表格内的宽度一定要设置成100%,.el-table__header和.el-table__body这个是框架内置的一些样式，得css重新更改

.el-table__header{
  width: 100%!important;
}
.el-table__body{
  width: 100%!important;
}

附带让表格内容超过自适宽度就换行

word-wrap: normal!important;
width: auto!important;
word-break: break-all!important;

修改完成后打印的表格展示就正常了 

 其中打印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 += "";

    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')
            }
          }
        }
      }
    }

    return this.dom.outerHTML;
  },

  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);
    }
  },
  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

print.css样式

@media print {

    section{
        margin-top: -35px;
    }
    .el-table__header{
      width: 100%!important;
    }
    .el-table__body{
      width: 100%!important;
    }
  .el-table__header{
    table-layout: auto;
    }
  .el-table__body{
    table-layout: auto!important;
  }

  .modal-body {
    min-height: auto;
  }

  .el-table--border th, .el-table--border td{
    border-right: 1px solid #ebeef5;
  }
  .el-table th, .el-table td{
    padding: 0px;
  }
  .el-table .cell{
    padding-right: 0px;
  }
  .el-table{
    width: 100%!important;
  }
}

具体vue页面部分关键代码