js生成二维码

 showShareCode($("#shareUrl").val());
function showShareCode(url){
    $("#shareCode").html('');
    var width = $(window).width();
    var qrcode = new QRCode(document.getElementById("shareCode") , {
        width : width *0.6,
        height : width *0.6  
    });
    qrcode.makeCode(url);

}