如何将两个json合并成一个

//调用方法：
var targetObject = [{name:"11",age:11}];
var sourceObject = [{name:"22",age:22}];
var result = $.extend(true,targetObject,sourceObject);

//手写拼接：
var str1=[{name:"11",age:11}];
var str2=[{name:"22",age:22}];

var str3 = [];

for (var i = 0; i < str1.length; i++) {
    str3.push(str1[i]);
}

for (var i = 0; i < str2.length; i++) {
    str3.push(str2[i]);
}

--------------

var str3 = str1.concat(str2);