Uncaught TypeError：無法讀取屬性'0'的undefined

Question

var names = ["andy","amy","randy","ronaldo","nani"]; 

for(var i = 0;i<names.length;i++){ 
    console.log("My name is " . names[i]); 
} 

我想知道這裏有什麼問題。爲什麼我不能是零？

Answer 1

JavaScript並不是PHP和字符串連接在這裏正在通過+而不是.：

var names = ["andy","amy","randy","ronaldo","nani"]; 

for(var i = 0;i<names.length;i++){ 
    console.log("My name is " + names[i]); 
} 

Answer 2

的錯誤是因爲.在

console.log("My name is " . names[i]); 

將其更改爲逗號（,）或加號（+）的這樣

console.log("My name is ", names[i]); 
console.log("My name is " + names[i]); 

Answer 3

我想你混淆javascript拼接與php

變種名稱=「安迪」，「艾米」，「好色」，「羅」，「納尼」];

for(var i in names){ 
    console.log("My name is " + names[i]); // change . with + here 
} 

還可以最大限度地減少與var i in names

檢查這個http://jsfiddle.net/g96T8/