js里面的有序排列、无序排列_js有序列表和无序列表

<script type="text/javascript">
var arr = ['a','b','c','d'];//sort 默认为字符串的转换 '200' '30' 3>2
arr.sort();
alert(arr);//a,b,c,d
 
var arr2 =[5,2,3,78,9,5,6]
arr2.sort(function(a,b){
	return a-b;
});
alert(arr2);
 
var arr3 = ['10px','20px','9px','2px'];
arr3.sort(function(a,b){
	return parseInt(a)-parseInt(b);
});
alert(arr3);
 
//无序排
var arr4 = [1,2,3,4,5,6,7];
arr4.sort(function(a,b){
	return Math.random()-0.5;//Math.random()值为:0-1 之间的随机数
});
alert(arr4);
</script>