我一直收到这个错误“Uncaught TypeError：name.push不是一个函数 <anonymous> ：10：7”

Question

 var name = []; var input = prompt("what u want?"); while (input !== "quit"){ if (input === "list"){ console.log(name); } else if(input === "new"){ var hold = prompt("Enter"); name.push(hold); } input = prompt("What u want?"); } console.log("u quit"); 

So here is the situation, i am trying to run this TODO_APP and i think i did everything right, but i am keep on getting error at push section "name.push is not a function" tell me where i am doing wrong..

Answer 1

You can't change the type of name as it is already defined globally . Use a different variable - name1 .

 var name1 = []; var input = prompt("what u want?"); while (input !== "quit") { if (input === "list") { console.log(name1); } else if (input === "new") { var hold = prompt("Enter"); name1.push(hold); } input = prompt("What u want?"); } console.log("u quit"); 

Answer 2

Issue in your code is that, any variable that is defined outside any function is added in global scope( window ). Now window already has a property called name and you cannot override it. Hence it throws error.

Solution:

• Change the variable name
• Wrap code in a IIFE so you do not bleed to global scope. Following is a sample of it.

 (function() { var name = []; var input = prompt("what u want?"); while (input !== "quit") { if (input === "list") { console.log(name); } else if (input === "new") { var hold = prompt("Enter"); name.push(hold); } input = prompt("What u want?"); } console.log("u quit", name); })() 

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Note: its a bad practice to bleed to global scope.

References:

• Why are global variables considered bad practice?
• Window.name property