give an example
var a = function (ctx) {
debugger // ctx {data: 555, name: 777}
b(ctx);
debugger; // ctx {data: 555, name: 777}
return ctx;
}
var b = function (ctx) {
ctx.age = 7; //
ctx = ctx.data; // ctx 555
debugger; // ctx 555
}
let d = a({
data: 555,
name: 777
});
console.log(d); // {data: 555, name: 777, age: 777} ??? 555
I"m a little confused. This is a value passed by reference type. The b function makes changes to the incoming object, and adding a age attribute works. But ctx = ctx.data; doesn"t work. I"m a little blinded.
OK, got it, because after ctx = ctx.data , I was disconnected from the original object
like
var obj = {}
obj = 123;
reference has been disconnected, the b function does not change the ctx object, but the variable ctx in the b function points to, and the a function still points to the original function.