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js 处理数组,把指定位置的元素换成最后一个元素并删除最后一个元素
var arr = new Array(6);
arr[0] = "George";
arr[1] = "John";
arr[2] = "Thomas";
arr[3] = "James";
arr[4] = "Adrew";
arr[5] = "Martin";
arr.splice(2,1,arr.pop());
console.log(arr);
输出下面的结果:
[ 'George', 'John', 'Martin', 'James', 'Adrew' ]
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