sort() 方法用於對數組的元素進行排序。javascript
若是想按照其餘標準進行排序,就須要提供比較函數,該函數要比較兩個值,而後返回一個用於說明這兩個值的相對順序的數字。比較函數應該具備兩個參數 a 和 b,其返回值以下:html
<script type="text/javascript"> function sortNumber(a,b) { return a - b } var arr = new Array(6) arr[0] = "10" arr[1] = "5" arr[2] = "40" arr[3] = "25" arr[4] = "1000" arr[5] = "1" document.write(arr + "<br />") document.write(arr.sort(sortNumber)) </script>
輸出:
10,5,40,25,1000,1 1,5,10,25,40,1000
var arr = [ {name: 'a', phone: 1, value: "上海"}, {name: 'b', phone: 5, value: "大連"}, {name: 'd', phone: 3, value: "北京"}, {name: 'c', phone: 4, value: "拉薩"} ]; arr.sort(function(a,b){ return a.value.localeCompare(b.value) });
//返回["北京", "大連", "拉薩", "上海", "天津"]