/*正常的情况*/ var a = 5; var b = a; b += 3; alert(b); //8 alert(a); //5 //对象和函数都是引用的关系 var a = [1,2,3]; var b = a; b.push(4); alert(b); //1,2,3,4 alert(a); //1,2,3,4*/ //数组重新写 var a = [1,2,3]; var b = a; b = [1,2,3,4]; alert(b); //1,2,3,4 alert(a); //1,2,3 /*对象赋值*/ var obj = { a : 10 }; var obj2 = obj; obj2.a = 20; alert(obj.a); //20*/ //赋值解决方案 var obj = { a : 10 }; function copy(obj){ //浅拷贝 var newObj = {}; for(var attr in obj){ newObj[attr] = obj[attr]; } return newObj; } var obj2 = copy(obj); obj2.a = 20; alert(obj.a); //10 //解决方案二 function deepCopy(obj){ //深拷贝 if(typeof obj != 'object'){ console.trace(); return obj; } var newObj = {}; for(var attr in obj){ newObj[attr] = deepCopy(obj[attr]); } return newObj; } var obj2 = deepCopy(obj); obj2.a.b = 20; alert(obj.a.b); //10