实现在线动态打印带图表的VUE页面文件内容

// 打印类属性、方法定义/* eslint-disable */constPrint=function (dom, options) {
if (!(thisinstanceofPrint)) returnnewPrint(dom, options);
this.options=this.extend({
'noPrint': '.no-print'        }, options);
if ((typeofdom) ==="string") {
this.dom=document.querySelector(dom);
    } else {
this.isDOM(dom)
this.dom=this.isDOM(dom) ?dom : dom.$el;
    }
this.init();
};
Print.prototype= {
init: function () {
varcontent=this.getStyle() +this.getHtml();
this.writeIframe(content);
    },
extend: function (obj, obj2) {
for (varkinobj2) {
obj[k] =obj2[k];
      }
returnobj;
    },
getStyle: function () {
varstr="",
styles=document.querySelectorAll('style,link');
for (vari=0; i<styles.length; i++) {
str+=styles[i].outerHTML;
        }
str+="<style>"+ (this.options.notPrint?this.options.notPrint : '.no-print') +"{display:none;}</style>";
str+="<style>.results{width:100%!important;} .result .title{width:100%;}</style>"; 
returnstr;
    },
getHtml: function () {
varinputs=document.querySelectorAll('input');
vartextareas=document.querySelectorAll('textarea');
varselects=document.querySelectorAll('select');
varcanvass=document.querySelectorAll('canvas');
for (vark=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')
          }
        } elseif (inputs[k].type=="text") {
inputs[k].setAttribute('value', inputs[k].value)
        } else {
inputs[k].setAttribute('value', inputs[k].value)
        }
      }
for (vark2=0; k2<textareas.length; k2++) {
if (textareas[k2].type=='textarea') {
textareas[k2].innerHTML=textareas[k2].value        }
      }
for (vark3=0; k3<selects.length; k3++) {
if (selects[k3].type=='select-one') {
varchild=selects[k3].children;
for (variinchild) {
if (child[i].tagName=='OPTION') {
if (child[i].selected==true) {
child[i].setAttribute('selected', "selected")
              } else {
child[i].removeAttribute('selected')
              }
            }
          }
        }
      }
//canvass echars图表转为图片for (vark4=0; k4<canvass.length; k4++) {
varimageURL=canvass[k4].toDataURL("image/png");
varimg=document.createElement("img");
img.src=imageURL;
img.setAttribute('style', 'max-width: 100%;');
img.className='isNeedRemove'canvass[k4].style.display='none'canvass[k4].parentNode.style.width='100%'canvass[k4].parentNode.style.textAlign='center'canvass[k4].parentNode.insertBefore(img,canvass[k4].nextElementSibling);
      }
//做分页//style="page-break-after: always"varpages=document.querySelectorAll('.result');
for (vark5=0; k5<pages.length; k5++) {
pages[k5].setAttribute('style', 'page-break-after: always');
      }
returnthis.dom.outerHTML;
    },
writeIframe: function (content) {
varw, 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:' + document.querySelector('.results').clientWidth + 'px;height:0;top:-10px;left:-10px;');w=f.contentWindow||f.contentDocument;
doc=f.contentDocument||f.contentWindow.document;
doc.open();
doc.write(content);
doc.close();
varremoves=document.querySelectorAll('.isNeedRemove');
for (vark=0; k<removes.length; k++) {
removes[k].parentNode.removeChild(removes[k]);
        }
var_this=thisiframe.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: (typeofHTMLElement==='object') ?function (obj) {
returnobjinstanceofHTMLElement;
    } :
function (obj) {
returnobj&&typeofobj==='object'&&obj.nodeType===1&&typeofobj.nodeName==='string';
    }
};
constMyPlugin= {}
MyPlugin.install=function (Vue, options) {
// 4. 添加实例方法Vue.prototype.$print=Print}
exportdefaultMyPlugin

print(){      
letself=this;
self.$print(self.$refs.print,{'notPrint':'.no-print'});
},