使用jQuery，我如何通過arg來運行，然後顯示來自預定義變量的消息

Question

我想調用這個函數，傳遞它作爲arg的錯誤類型，然後顯示消息。

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); 
} 

如何調用該函數msgDialog（loginMsg），並有我可以分配到正確消息的變種，然後做的東西？我在這裏提醒它，但我會以不同的方式顯示它。我知道我需要用arg值的值創建一個新的var，但不知道如何。謝謝。

Answer 1

這是純粹的JavaScript，沒有jQuery。試試這個：

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." 

你可以得到什麼事情here如果你以前沒關閉的JavaScript看到的想法。