[英]How to sort an array in JavaScript
我没有使用关联数组。 我正在使用像这样的1d数组,
array("1,a","5,b","2,c","8,d","6,f");
我该如何排序这个数组?
结果应该是,
array("1,a","2,c","5,b","6,f","8,d");
没有自定义排序功能的sort()
将按照您的意愿(按字典顺序)对其进行排序。
>>> ["1,a","5,b","2,c","8,d","6,f"].sort();
["1,a", "2,c", "5,b", "6,f", "8,d"]
请注意,这将对原始数组进行排序。 您可以使用slice()
创建浅表副本。
如果您的任何数字大于9
,并且您想通过数字的序数对其进行排序,则需要自定义排序功能。
["1,a","5,b","2,c","8,d","6,f"].sort(function(a, b) {
return parseInt(a, 10) - parseInt(b, 10);
});
使用array.sort()
内置JS函数。 文档: http : //www.w3schools.com/jsref/jsref_sort.asp
试试这个
<script>
var abc=new Array("1,a","5,b","2,c","8,d","6,f");
document.write("<br/>");
document.write(abc.sort());
</script>
var arrayVar = ["1,a","2,c","5,b","6,f","8,d"];
arrayVar.sort()
arrayVar; // "1,a","2,c","5,b","6,f","8,d"
尝试:
function sortNumber(a,b)
{
return (a.split(","))[0] - (b.split(","))[0] ;
}
var n = ["1,a","5,b","2,c","8,d","6,f"];
alert( n.sort(sortNumber) );
这是我做的:
var arr1 = new Array("1,a","5,b","2,c","8,d","6,f");
var arr2 = arr1.sort( function(a, b){
var ax = a.split(",");
var bx = b.split(",");
return ax[0]-bx[0];
});
document.getElementById("result").innerHTML = arr2.join(" : ");
你需要编写自己的比较函数来比较数字,否则默认的sort()
会在"5,b"
之前加上类似"40,a"
东西。
这是一个例子,它只是在字符上进行分割,
并假定它在数值之前的值。 我在示例中添加了"40,a"
,表明它正确地命令数字> 9。
function mySort(a,b)
{
return a.split(",", 1) - b.split(",", 1);
}
var theArray = ["1,a", "5,b", "2,c", "40,a", "8,d", "6,f"];
theArray.sort(mySort); // "1,a","2,c","5,b","6,f","8,d","40,a"
我将继续并假设您要先按数字部分排序,按数字排序,然后在逗号后面的位上进行二级词法(字符串)排序。 这样一个像“11,a”这样的值将在“2,a”之后结束 - 如果你只是做一个默认排序“11,a”将在“2,a”之前结束。 所以:
var a = ["1,a","11,a","8,a","24,z","5,b","2,c","8,d","6,f"];
a.sort(function(a,b) {
var aparts = a.split(","),
bparts = b.split(","),
anum = +aparts[0], // convert first part to number
bnum = +bparts[0],
aletter = aparts[1],
bletter = bparts[1];
if (anum === bnum)
return aletter < bletter ? -1 : aletter === bletter ? 0 : -1;
else
return anum - bnum;
});
结果:
["1,a", "2,c", "5,b", "6,f", "8,a", "8,d", "11,a", "24,z"]
试试这个:
<script type="text/javascript">
var testArray = new Array();
testArray[0] = '1';
testArray[1] = '5';
testArray[2] = '9';
testArray[3] = '8';
testArray[4] = '6';
testArray[5] = '2';
var getlength = testArray.length;
testArray.sort(function(a,b){return a - b});
for(var i=0; i<getlength;i++) {
alert(testArray[i]);
}
</script>
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