javascript javascript按字符串属性对对象数组进行排序
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javascript sorting array of objects by string property
提问by user8528721
I am trying to sort an array of object by a property title. This the code snippet that I am running but it does not sort anything. The array is displayed as it is. P.S I looked at previous similar questions. This one for example heresuggests and uses the same method I am using.
我正在尝试按属性对对象数组进行排序title。这是我正在运行的代码片段，但它没有对任何内容进行排序。数组按原样显示。PS我看了以前的类似问题。例如，这里建议并使用我正在使用的相同方法。
The javascript:
javascript：
function sortLibrary() {
// var library is defined, use it in your code
// use console.log(library) to output the sorted library data
console.log("inside sort");
library.sort(function(a,b){return a.title - b.title;});
console.log(library);
}
// tail starts here
var library = [
{
author: 'Bill Gates',
title: 'The Road Ahead',
libraryID: 1254
},
{
author: 'Steve Jobs',
title: 'Walter Isaacson',
libraryID: 4264
},
{
author: 'Suzanne Collins',
title: 'Mockingjay: The Final Book of The Hunger Games',
libraryID: 3245
}
];
sortLibrary();
The html code:
html代码：
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<h1> Test Page </h1>
<script src="myscript.js"> </script>
</body>
</html>
回答by Always Sunny
Have you tried like this? It is working as expected
你试过这样吗？它按预期工作
library.sort(function(a,b) {return (a.title > b.title) ? 1 : ((b.title > a.title) ? -1 : 0);} );
var library = [
{
author: 'Bill Gates',
title: 'The Road Ahead',
libraryID: 1254
},
{
author: 'Steve Jobs',
title: 'Walter Isaacson',
libraryID: 4264
},
{
author: 'Suzanne Collins',
title: 'Mockingjay: The Final Book of The Hunger Games',
libraryID: 3245
}
];
console.log('before sorting...');
console.log(library);
library.sort(function(a,b) {return (a.title > b.title) ? 1 : ((b.title > a.title) ? -1 : 0);} );
console.log('after sorting...');
console.log(library);回答by big nol
Use the < or > operator when comparing strings in your compare function.
在比较函数中比较字符串时使用 < 或 > 运算符。
回答by spanky
Subtraction is for numeric operations. Use a.title.localeCompare(b.title)instead.
减法用于数字运算。使用a.title.localeCompare(b.title)来代替。
function sortLibrary() {
console.log("inside sort");
library.sort(function(a, b) {
return a.title.localeCompare(b.title);
});
console.log(library);
}
var library = [{
author: 'Bill Gates',
title: 'The Road Ahead',
libraryID: 1254
},
{
author: 'Steve Jobs',
title: 'Walter Isaacson',
libraryID: 4264
},
{
author: 'Suzanne Collins',
title: 'Mockingjay: The Final Book of The Hunger Games',
libraryID: 3245
}
];
sortLibrary();回答by Christian
you can try this code from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort
您可以从https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort尝试此代码
library.sort(function(a, b){
var tA = a.title.toUpperCase();
var tB = b.title.toUpperCase();
if (tA < tB) {
return -1;
}
if (tA > tB) {
return 1;
}
return 0;
})
回答by Nuttertools
Can you try this
你能试试这个吗
FOR DESC
用于 DESC
library.sort(function(a,b){return a.title < b.title;});
or FOR ASC
或升序
library.sort(function(a,b){return a.title > b.title;});
