[JavaScript] Function Parameter 預設值.

部份programming language 寫function call 時可以支援default value, 可惜JavaScript不能. 故須要特別處理.

function alertDialog(message, title, okCallBack)
    {
        message=typeof message !== 'undefinded'? message: "";
        title=typeof title!=='undefinded'? title: "Dialog";
        okCallBack=typeof okCallBack!=='undefined'? okCallBack: function (dialogRef) {
            dialogRef.close();
        };

        BootstrapDialog.show({
            title: title,
            message: message,
            buttons: [{
                label: '<U>O</U>K',
                hotkey: 79, // Keycode of keyup event of key 'o' is 79.
                action: okCallBack
            }]
        });
    }