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                            ~~~
var a = 0;
var b = a;
b++;
alert(a); //=>"0"
var o = {};
o.a = 0;
var b = o;
b.a = 10;
alert(o.a); //=>"10" 
~~~

![](https://img.kancloud.cn/7a/5d/7a5d2d67a698e46e20cf893e755f21cc_594x530.png)
~~~
let x = [1, 2, 3];
let y = x;
let z = [4, 5, 6];
y[0] = 10;
y = z;
z[1] = 20;
x[2] = z = 30;
console.log(x, y, z); 
~~~
![](https://img.kancloud.cn/aa/f0/aaf033fc42e1a62c14adb63b412ea244_590x333.png)
![](https://img.kancloud.cn/90/1e/901eb354b1beb6eb770bc6c785291e88_883x515.png)

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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