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let china = {
    zhejiang: {
        hangzhou: 'xihu'
    }
};

//改造結(jié)構(gòu)
Object.keys(china).forEach(function(key){
    Object.keys(china[key]).forEach(function(subkey){
        china[subkey] = china[key][subkey];
    });
});

console.log( china['hangzhou'] );
/*
    xihu
*/

Is this what you mean?

let key = 'zhejiang';
console.log( china[key] )

Is this still the case? es2015 allows using variables as keys:

var b = 'foo';
var o ={
    [b] :'aa'
};
o[b]//aa

If not, just china[key], keywill report an error because it is not defined

This cannot be done unless you use for...in to traverse and output xihu