javascript - 使用 jQuery，我如何将 arg 传递给函数，然后显示来自预定义变量的消息

Question

我想调用这个函数，将它作为 arg 的错误类型传递，然后显示消息。

function msgDialog(msg) {
    // Define messages
    var errorMsg = "There has been an error.  We are sorry about that.";
    var loginMsg = "Something went awry with the login.  Please try again.";
    var uploadMsg = "Your upload failed.  Please try again.";
    var networkMsg = "You currently are not connected to the internet.  Please connect and try again.";
     alert(msg);
}

如何调用该函数 msgDialog(loginMsg) 并拥有一个可以分配给正确消息的 var，然后用它做些什么？我在这里提醒它，但我真的会以不同的方式显示它。我知道我需要使用 arg 值的值创建一个新的 var，但不确定如何。谢谢你。

Answer 1

那是纯 JavaScript，没有 jQuery。试试这个：

var msgDialog = (function() {
    var errors = {
        errorMsg : "There has been an error.  We are sorry about that.",
        loginMsg : "Something went awry with the login.  Please try again.",
        uploadMsg : "Your upload failed.  Please try again.",
        networkMsg : "You currently are not connected to the internet.  Please connect and try again."
    }

    return function(msg){
        alert(errors[msg]);
    }
})();

msgDialog('uploadMsg'); //  alerts "Your upload failed.  Please try again."

如果您以前没有见过 JavaScript 闭包，您可以了解这里发生了什么。