Javascript数组创建及其常见操作(1)(3)

push():数组末尾添加一个项

pop():删除数组最后一个项

代码:

varm=["am","bm","cm","dm","em","fm"];  
 
m.push("gm");//在数组末尾添加元素gm　  
 
alert(m);  
 
m.pop();//删除数组最后一个元素gm　  
 
alert(m);　  
 
varm=["am","bm","cm","dm","em","fm"];m.push("gm");  
//在数组末尾添加元素gmalert(m);m.pop();  
//删除数组最后一个元素gmalert(m);  
运行:<script>varm=["am","bm","cm","dm","em","fm"];  
m.push("gm");alert(m);m.pop();alert(m);</script> 
 
 
 

JavaScript 数组对象的队列操作:

unshift():数组头添加一个项

shift():删除数组第一个项

代码:

varm=["am","bm","cm","dm","em","fm"];  
 
m.unshift("gm");//在数组第一个元素位置添加元素gm　  
 
alert(m);  
 
m.shift();//删除数组第一个元素gm　  
 
alert(m);　  
 
varm=["am","bm","cm","dm","em","fm"];m.unshift("gm");  
//在数组第一个元素位置添加元素gmalert(m);m.shift();  
//删除数组第一个元素gmalert(m);  
运行:<script>varm=["am","bm","cm","dm","em","fm"];m.unshift("gm");  
alert(m);m.shift();alert(m);</script> 
 
 

◆ sort():

功能：数组按字符的ASCII码进行排序,修改数组对象

注:即便是数字数组,也将转化为字符串来进行比较排序

代码:

varm=["am","fm","gm","bm","em","dm"];  
 
m.sort();//按字母序排序　  
 
alert(m);　  
 
varm=["am","fm","gm","bm","em","dm"];m.sort();  
//按字母序排序alert(m);  
运行:<script>varm=["am","fm","gm","bm","em","dm"];  
m.sort();alert(m);</script>