其他答案假设数组包含字符串。我的方法更好，因为即使数组包含null、undefined或其他非字符串，它也能工作。

var notdefined;
var myarray = ['a', 'c', null, notdefined, 'nulk', 'BYE', 'nulm'];

myarray.sort(ignoreCase);

alert(JSON.stringify(myarray));    // show the result

function ignoreCase(a,b) {
    return (''+a).toUpperCase() < (''+b).toUpperCase() ? -1 : 1;
}

null将在'nulk'和'nulm'之间排序。但未定义的总是排在最后。

myArray.sort(
  function(a, b) {
    if (a.toLowerCase() < b.toLowerCase()) return -1;
    if (a.toLowerCase() > b.toLowerCase()) return 1;
    return 0;
  }
);

编辑: 请注意，我最初写这篇文章是为了说明技术，而不是考虑性能。也请参考回答@Ivan Krechetov更紧凑的解决方案。

arr.sort(function(a,b) {
    a = a.toLowerCase();
    b = b.toLowerCase();
    if (a == b) return 0;
    if (a > b) return 1;
    return -1;
});

你也可以使用Elvis操作符:

arr = ['Bob', 'charley', 'fudge', 'Fudge', 'biscuit'];
arr.sort(function(s1, s2){
    var l=s1.toLowerCase(), m=s2.toLowerCase();
    return l===m?0:l>m?1:-1;
});
console.log(arr);

给:

biscuit,Bob,charley,fudge,Fudge

localeCompare方法可能很好…

注意:Elvis操作符是if then else的“三元操作符”的缩写形式，通常带有赋值。 如果你从侧面看，它看起来像猫王… 例如:

if (y) {
  x = 1;
} else {
  x = 2;
}

你可以使用:

x = y?1:2;

也就是说，当y为真时，则返回1(用于赋值给x)，否则返回2(用于赋值给x)。

如果你在努力理解以下内容，这可能会有所帮助:

var array = ["sort", "Me", "alphabetically", "But", "Ignore", "case"];
console.log('Unordered array ---', array, '------------');

array.sort(function(a,b) {
    a = a.toLowerCase();
    b = b.toLowerCase();
    console.log("Compare '" + a + "' and '" + b + "'");

    if( a == b) {
        console.log('Comparison result, 0 --- leave as is ');
        return 0;
    }
    if( a > b) {
        console.log('Comparison result, 1 --- move '+b+' to before '+a+' ');
        return 1;
    }
    console.log('Comparison result, -1 --- move '+a+' to before '+b+' ');
    return -1;


});

console.log('Ordered array ---', array, '------------');


// return logic

/***
If compareFunction(a, b) is less than 0, sort a to a lower index than b, i.e. a comes first.
If compareFunction(a, b) returns 0, leave a and b unchanged with respect to each other, but sorted with respect to all different elements. Note: the ECMAscript standard does not guarantee this behaviour, and thus not all browsers (e.g. Mozilla versions dating back to at least 2003) respect this.
If compareFunction(a, b) is greater than 0, sort b to a lower index than a.
***/

http://jsfiddle.net/ianjamieson/wmxn2ram/1/

在(几乎:)一行代码中

["Foo", "bar"].sort(function (a, b) {
    return a.toLowerCase().localeCompare(b.toLowerCase());
});

结果是

[ 'bar', 'Foo' ]

而

["Foo", "bar"].sort();

结果

[ 'Foo', 'bar' ]