打印特定元素内容

function ClickToPrint(elementId)
{
var printContent = document.getElementById(elementId);
var windowUrl = 'about:blank';
var uniqueName = new Date();
var windowName = 'Print' + uniqueName.getTime();
var printWindow = window.open(windowUrl, windowName, 'left=50000,top=50000,width=450,height=300');
printWindow.document.write(printContent.innerHTML);
printWindow.document.close();
printWindow.focus();
printWindow.print();
printWindow.close();
}