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//1. 循环一个数组， 通过push方法将元素添加到另一个数组  
var a = [1,2,3];
var b = [4,5,6];
for(var i in b){
    a.push(b[i]);
}
console.log("concat: " + a); 

//2. 数组连接 concat
var a = [1,2,3];
var b = [4,5,6];
var c = a.concat(b); //[1,2,3,4,5,6]
console.log("concat: " + c); 

//3. 拼接 splice
var a = [1,2,3,4,5];
a.splice(2,1,6,7); //[ 1,2,6,7,4,5]
console.log("splice: " + a); 

//4. 互换两个位置
var a = [1,2,3,4,5,6];
var up = a[2];
var cur = a[3];
a[2] = cur;
a[3] = up;
console.log("concat: " + a); 


//5. 字符串包含