js打印插件

// 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
        return this.dom.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
        while (currDom && currDom.tagName.toLowerCase() !== 'body') {
            if (prevDom) {
                let element = currDom.cloneNode(false)
                element.appendChild(prevDom)
                prevDom = element
            } else {
                prevDom = currDom.cloneNode(true)
            }

            currDom = currDom.parentElement
        }
        return currDom.tagName.toLowerCase() === 'body' ? currDom : prevDom
    },

    writeIframe: function (content) {

        if (this.getExplorer() == "IE") {
            this.pagesetup_null();
        }

        var doc = null;
        var iframe = document.createElement('iframe');
        document.body.appendChild(iframe);
        iframe.id = "myIframe";
        iframe.setAttribute('style', 'position:absolute;width:0;height:0;top:-10px;left:-10px;');
        doc = iframe.contentWindow.document;
        doc.open();
        doc.write(content);
        doc.close();
        iframe.contentWindow.focus();
        iframe.onload = function () {
            this.contentWindow.print();
            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';
        },
    pagesetup_null() {
        var hkey_root, hkey_path, hkey_key;
        hkey_root = "HKEY_CURRENT_USER";
        hkey_path = "\\Software\\Microsoft\\Internet Explorer\\PageSetup\\";
        try {
            var RegWsh = new ActiveXObject("WScript.Shell");
            hkey_key = "header";
            RegWsh.RegWrite(hkey_root + hkey_path + hkey_key, "");
            hkey_key = "footer";
            RegWsh.RegWrite(hkey_root + hkey_path + hkey_key, "");
        } catch (e) { }
    },
    getExplorer() {
        var explorer = window.navigator.userAgent;
        //ie 
        if (explorer.indexOf("MSIE") >= 0) {
            return "IE";
        }
        //firefox 
        else if (explorer.indexOf("Firefox") >= 0) {
            return "Firefox";
        }
        //Chrome
        else if (explorer.indexOf("Chrome") >= 0) {
            return "Chrome";
        }
        //Opera
        else if (explorer.indexOf("Opera") >= 0) {
            return "Opera";
        }
        //Safari
        else if (explorer.indexOf("Safari") >= 0) {
            return "Safari";
        }
    }
};
export default  Print

使用

// html-dom为DOM的ID
Print("html-dom")