var arr1 = [ 1,2,3 ];
var arr2 = [ 4,5,6 ];
var arr3 = [ 7,8,9 ];
alert( arr1.concat( arr2, arr3 ) );
转载于:https://www.cnblogs.com/TianHero/p/6050676.html
var arr1 = [ 1,2,3 ];
var arr2 = [ 4,5,6 ];
var arr3 = [ 7,8,9 ];
alert( arr1.concat( arr2, arr3 ) );
转载于:https://www.cnblogs.com/TianHero/p/6050676.html