function xyqrcode(options) {
    var settings = {
        dom:'',
        render: 'canvas',   //生成二維碼的格式還有image、div
        ecLevel:"H",
        text:"",
        background:"#ffffff", 
        fill:"#333333", //二維碼紋路的顏色
        fontcolor:"#ff9818",
        fontname:"Ubuntu",
        image:{},
        label:"",
        mPosX:0.5,   //圖片在X軸的位置
        mPosY:0.5,    //圖片在X軸的位置
        mSize:0.27,   //圖片大小
        minVersion:10,
        mode:4,
        quiet:1,
        radius:1,
        size:400   
    };
        if (options) {
            $.extend(settings, options);//options物件跟settings比較，相同的就替換，沒有的就新增

        }
        if(settings.dom.length==0){
            window.console.log("Error: dom empty!");
            return;
        }
        if(settings.url.length==0){
            window.console.log("Error: url empty!");
            return;
        }
    settings.text=settings.url; //在qrcode生成二維碼的地址是text。這裡就把url賦值給text
        $(settings.dom).qrcode(settings);
      
}