var m1 = [5, 6, 2];
var m2 = [4, 2, 6];
var m3 = new Array();
m1 = m1.concat(m2);
for (var i = 0; i < m1.length; i++) {
if (i != m1.length - 3)
m3.push(m1[i]);
}
alert(m3);
原文：http://www.cnblogs.com/wwg1990/p/5438039.html