var o1 = {a:1,b:3,c:3},o2 = {b:5,c:4,d:6};
a = eval("("+(JSON.stringify(o1)+JSON.stringify(o2)).replace(/}{/,",")+")");
console.log(a)
结果为：Object {a: 1, b: 5, c: 4, d: 6}
原文：http://www.cnblogs.com/silvacheng/p/6154792.html