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[英]How can I add new array elements at the beginning of an array in JavaScript?
[英]How do I add new elements to an array using a promt in javascript?
我正在尝试在 js 上运行一个非常简单的代码,这应该从提示符将元素添加到数组中,但没有任何反应。 这是代码:
HTML:
<body onload="loadBooks()">
<button onclick="myFunction()">Add your Favourite</button>
<p id="books"></p>
JS:
var books= ["Little Prince","The Alchemist","Alice in Wonderland"];
function loadBooks(){
document.getElementById('books').innerHTML= books;
}
function myFunction(){
var book= prompt("What is your favourite book?");
books[books.lenght]=book;
document.getElementById("books").innerHTML= books;
}
它有什么问题?
您拼错了length
(您拼写了它lenght
)。
规范的方法是像这样使用var new_length = array.push(elements...)
:
books.push(book);
修复了您的代码并且几乎没有改进-
<script>
// your custom ajax request here
var books = ["Little Prince", "The Alchemist", "Alice in Wonderland"];
function loadBooks() {
document.getElementById('books').innerHTML = books;
}
function myFunction() {
var book = prompt("What is your favourite book?");
books[books.length] = book;
loadBooks();
}
</script>
<body onload="loadBooks()">
<button onclick="myFunction()">Add your Favourite</button>
<p id="books"></p>
</body>
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