javaScript 核心程式碼

<script >

    function printPartOfDocument() {  
        this.init.apply(this, arguments)  
    }  

    printPartOfDocument.prototype = {  

        init: function(o, part) { 
            this.o = this.getId(o);  
            this.part = this.getId(part);  
            this.frame = '';  
            this.printCss = '';  
            var _this = this;  
            this.addEvent(this.o, 'click',  
            function() {  
                _this.create()  
            });  
        },  

        create: function() {  

            var _this = this;  
            if (!this.frame) { 
                var oFrame = document.createElement('iframe');  
                oFrame.setAttribute('id', 'printIframe');  
                oFrame.style.position = 'absolute';  
                oFrame.style.left = '-9999px';  
                document.body.appendChild(oFrame);  

            }  

            if (!this.printCss) this.printCss = this.getPrintCss();

            setTimeout(function() {  
                _this.frame = document.getElementById('printIframe'),  
                d = _this.frame.contentWindow.document,  
                h = d.getElementsByTagName('head')[0],  
                b = d.getElementsByTagName('body')[0];  

                for (var i = 0; i < _this.printCss.length; i++) {  

                    h.appendChild(_this.printCss[i]);  

                }  

                b.innerHTML = '';  
                b.appendChild(_this.part.cloneNode(true));  
                _this.frame.contentWindow.print();  

            },  

            0);  

        },  

        getPrintCss: function() {  
            var styles = document.getElementsByTagName('head')[0].getElementsByTagName('link'),  
            printCss = [];  
            
            for (var i = 0; i < styles.length; i++) {  

                var attr = styles[i].getAttribute('media');  

                if (attr == 'all' || attr == 'print') printCss.push(styles[i].cloneNode(true));  

            }  

            return printCss;  

        },  

        getId: function(el) {  

            return typeof el == 'string' ? document.getElementById(el) : el  

        },  

        addEvent: function(o, type, fn) {  

            if (o.addEventListener) {  

                o.addEventListener(type, fn, false)  

            } else if (o.attachEvent) {  

                o.attachEvent('on' + type,  

                function() {  

                    fn.call(o, window.event)  

                })  

            }  

        }  
    }  

</script>
 

HTML頁面呼叫

                    <section class="mail-list">
                        <div class="wrapper" style="padding-top: 0px;">
                            <!-- 主題內容 -->
                            <div class="row">
                                <div class="col-lg-12" id="print_content">
                                    內容..............
                                </div>
                            </div>
                        </div>
                    </section>
<script>
		new printPartOfDocument('print','print_content');   // html標籤的id="print_content"
</script>