javascript 数组 delete 和 splice

javascript 数组

delete方法

var array = ["zero","one","two","three","four"];

delete array[2]; //["zero","one",undefined,"three","four"];

alert(array.length);//5

删掉的部分将会用 undefined 替换，这样很不爽

下面介绍一个 splice方法

array.splice(2,1);

第一个参数代表数组中下标的位置，第二个为删掉的个数,删掉之后，后面的数据会上移

["zero","one","three","four"];

alert(array.length);//4