blocks|key|264314|text|你可以做到|type|unstyled|depth|inlineStyleRanges|entityRanges|data|264315|hash.inject({}){%7Coption,+(k,v)+%7C+option["id"]+=+v+if+k+==+"_id";+option}|code-block|syntax|javascript|264316|这应该适用于您的情况！|264317|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

you can do 

<pre><code>hash.inject({}){|option, (k,v) | option["id"] = v if k == "_id"; option}
</code></pre>

This should work for your case!

blocks|key|266562|text|如果所有的键都是字符串，并且它们都有下划线前缀，那么您可以使用以下内容来修补散列：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|266563|h.keys.each+{+%7Ck%7C+h[k[1,+k.length+-+1]]+=+h[k];+h.delete(k)+}|code-block|syntax|javascript|266564|k[1,+k.length+-+1]位捕获除第一个字符之外的所有k。如果你想要一份拷贝，那么：|offset|length|style|CODE|266565|new_h+=+Hash[h.map+{+%7Ck,+v%7C+[k[1,+k.length+-+1],+v]+}]|266566|或|266567|new_h+=+h.inject({+})+{+%7Cx,+(k,v)%7C+x[k[1,+k.length+-+1]]+=+v;+x+}|266568|如果您不喜欢提取子字符串的k[]表示法，也可以使用sub：|266569|h.keys.each+{+%7Ck%7C+h[k.sub(/\A_/,+'')]+=+h[k];+h.delete(k)+}
Hash[h.map+{+%7Ck,+v%7C+[k.sub(/\A_/,+''),+v]+}]
h.inject({+})+{+%7Cx,+(k,v)%7C+x[k.sub(/\A_/,+'')]+=+v;+x+}|266570|而且，如果只有一些键具有下划线前缀：|266571|h.keys.each+do+%7Ck%7C
++if(k[0,1]+==+'_')
++++h[k[1,+k.length+-+1]]+=+h[k]
++++h.delete(k)
++end
end|266572|可以对上述所有其他变体进行类似的修改，但这两个变体除外：|266573|Hash[h.map+{+%7Ck,+v%7C+[k.sub(/\A_/,+''),+v]+}]
h.inject({+})+{+%7Cx,+(k,v)%7C+x[k.sub(/\A_/,+'')]+=+v;+x+}|266574|对于不带下划线前缀的键应该没有额外的修改。|266575|entityMap|0|LINK|mutability|MUTABLE|url|http://ruby-doc.org/core/String.html#method-i-5B-5D|1|http://ruby-doc.org/core/String.html#method-i-sub^0|0|0|0|I|W|1|0|I|0|0|0|0|0|D|3|P|3|P|3|1|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1H|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|1I|8|@$I|1J|J|1K|K|L]|$I|1L|J|1M|K|L]]|9|@$I|1N|J|1O|1|1P]]|A|$]]|$1|M|3|N|5|D|7|1Q|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1R|8|@]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1S|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1T|8|@$I|1U|J|1V|K|L]|$I|1W|J|1X|K|L]]|9|@$I|1Y|J|1Z|1|20]]|A|$]]|$1|U|3|V|5|D|7|21|8|@]|9|@]|A|$E|F]]|$1|W|3|X|5|6|7|22|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|23|8|@]|9|@]|A|$E|F]]|$1|10|3|11|5|6|7|24|8|@]|9|@]|A|$]]|$1|12|3|13|5|D|7|25|8|@]|9|@]|A|$E|F]]|$1|14|3|15|5|6|7|26|8|@]|9|@]|A|$]]|$1|16|3|-4|5|6|7|27|8|@]|9|@]|A|$]]]|17|$18|$5|19|1A|1B|A|$1C|1D]]|1E|$5|19|1A|1B|A|$1C|1F]]]]

If all the keys are strings and all of them have the underscore prefix, then you can patch up the hash in place with this:

<pre><code>h.keys.each { |k| h[k[1, k.length - 1]] = h[k]; h.delete(k) }
</code></pre>

The <a href="http://ruby-doc.org/core/String.html#method-i-5B-5D" rel="noreferrer"><code>k[1, k.length - 1]</code></a> bit grabs all of <code>k</code> except the first character. If you want a copy, then:

<pre><code>new_h = Hash[h.map { |k, v| [k[1, k.length - 1], v] }]
</code></pre>

Or

<pre><code>new_h = h.inject({ }) { |x, (k,v)| x[k[1, k.length - 1]] = v; x }
</code></pre>

You could also use <a href="http://ruby-doc.org/core/String.html#method-i-sub" rel="noreferrer"><code>sub</code></a> if you don't like the <code>k[]</code> notation for extracting a substring:

<pre><code>h.keys.each { |k| h[k.sub(/\A_/, '')] = h[k]; h.delete(k) }
Hash[h.map { |k, v| [k.sub(/\A_/, ''), v] }]
h.inject({ }) { |x, (k,v)| x[k.sub(/\A_/, '')] = v; x }
</code></pre>

And, if only some of the keys have the underscore prefix:

<pre><code>h.keys.each do |k|
 if(k[0,1] == '_')
 h[k[1, k.length - 1]] = h[k]
 h.delete(k)
 end
end
</code></pre>

Similar modifications can be done to all the other variants above but these two:

<pre><code>Hash[h.map { |k, v| [k.sub(/\A_/, ''), v] }]
h.inject({ }) { |x, (k,v)| x[k.sub(/\A_/, '')] = v; x }
</code></pre>

should be okay with keys that don't have underscore prefixes without extra modifications.

blocks|key|3176014|text|h.inject({})+{+%7Cm,+(k,v)%7C+m[k.sub(/%5E_/,'')]+=+v;+m+}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3176015|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>h.inject({}) { |m, (k,v)| m[k.sub(/^_/,'')] = v; m }
</code></pre>

blocks|key|264338|text|hash.each+{%7Ck,v%7C+hash.delete(k)+&&+hash[k[1..-1]]=v+if+k[0,1]+==+'_'}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|264339|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>hash.each {|k,v| hash.delete(k) &amp;&amp; hash[k[1..-1]]=v if k[0,1] == '_'}
</code></pre>

blocks|key|268003|text|hash[:new_key]+=+hash.delete+:old_key|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|268004|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>hash[:new_key] = hash.delete :old_key
</code></pre>

blocks|key|2962280|text|如果我们想在hash中重命名一个特定的键，那么我们可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2962281|假设我的散列是my_hash+=+{'test'+=>+'ruby+hash+demo'}|offset|length|style|CODE|2962282|现在我想将'test‘替换为'message'，然后：|2962283|my_hash['message']+=+my_hash.delete('test')|2962284|entityMap^0|0|7|12|0|0|0|17|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@$D|T|E|U|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

If we want to rename a specific key in hash then we can do it as follows:
 Suppose my hash is <code> my_hash = {'test' => 'ruby hash demo'} </code>
 Now I want to replace 'test' by 'message', then: 
<code> my_hash['message'] = my_hash.delete('test')</code>

blocks|key|3176059|text|rails+Hash有它的标准方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3176060|hash.transform_keys{+%7Ckey%7C+key.to_s.upcase+}|code-block|syntax|javascript|3176061|http://api.rubyonrails.org/classes/Hash.html#method-i-transform_keys|offset|length|3176062|更新:+ruby+2.5方法|3176063|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1W|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|V|8|@]|9|@$I|W|J|X|1|Y]]|A|$]]|$1|K|3|L|5|6|7|Z|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|H]]]]

rails Hash has standard method for it:

<pre><code>hash.transform_keys{ |key| key.to_s.upcase }
</code></pre>

<a href="http://api.rubyonrails.org/classes/Hash.html#method-i-transform_keys" rel="noreferrer">http://api.rubyonrails.org/classes/Hash.html#method-i-transform_keys</a>

UPD: ruby 2.5 method

blocks|key|2962345|text|我做得太过了，想出了以下几点。这背后的动机是附加到散列键，以避免在合并/扁平化散列时发生作用域冲突。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2962346|示例|2962347|扩展哈希类|2962348|将rekey方法添加到Hash实例。|2962349|#+Adds+additional+methods+to+Hash
class+::Hash
++#+Changes+the+keys+on+a+hash
++#+Takes+a+block+that+passes+the+current+key
++#+Whatever+the+block+returns+becomes+the+new+key
++#+If+a+hash+is+returned+for+the+key+it+will+merge+the+current+hash+
++#+with+the+returned+hash+from+the+block.+This+allows+for+nested+rekeying.
++def+rekey
++++self.each_with_object({})+do+%7C(key,+value),+previous%7C
++++++new_key+=+yield(key,+value)
++++++if+new_key.is_a?(Hash)
++++++++previous.merge!(new_key)
++++++else
++++++++previous[new_key]+=+value
++++++end
++++end
++end
end|code-block|syntax|javascript|2962350|前置示例|2962351|my_feelings_about_icecreams+=+{
++vanilla:+'Delicious',
++chocolate:+'Too+Chocolatey',
++strawberry:+'It+Is+Alright...'
}

my_feelings_about_icecreams.rekey+{+%7Ckey%7C+"#{key}_icecream".to_sym+}
#+=>+{:vanilla_icecream=>"Delicious",+:chocolate_icecream=>"Too+Chocolatey",+:strawberry_icecream=>"It+Is+Alright..."}|2962352|修剪示例|2962353|{+_id:+1,+___something_:+'what?!'+}.rekey+do+%7Ckey%7C
++trimmed+=+key.to_s.tr('_',+'')
++trimmed.to_sym
end
#+=>+{:id=>1,+:something=>"what?!"}|2962354|展平和附加“作用域”|2962355|如果你将散列传递回rekey，它将合并散列，从而允许你扁平化集合。这允许我们在扁平化散列时向键添加作用域，以避免在合并时覆盖键。|2962356|people+=+{
++bob:+{
++++name:+'Bob',
++++toys:+[
++++++{+what:+'car',+color:+'red'+},
++++++{+what:+'ball',+color:+'blue'+}
++++]
++},
++tom:+{
++++name:+'Tom',
++++toys:+[
++++++{+what:+'house',+color:+'blue;+da+ba+dee+da+ba+die'+},
++++++{+what:+'nerf+gun',+color:+'metallic'+}
++++]
++}
}

people.rekey+do+%7Cperson,+person_info%7C
++person_info.rekey+do+%7Ckey%7C
++++"#{person}_#{key}".to_sym
++end
end

#+=>
#+{
#+++:bob_name=>"Bob",
#+++:bob_toys=>[
#+++++{:what=>"car",+:color=>"red"},
#+++++{:what=>"ball",+:color=>"blue"}
#+++],
#+++:tom_name=>"Tom",
#+++:tom_toys=>[
#+++++{:what=>"house",+:color=>"blue;+da+ba+dee+da+ba+die"},
#+++++{:what=>"nerf+gun",+:color=>"metallic"}
#+++]
#+}|2962357|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|15|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|16|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|18|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|T|5|J|7|1A|8|@]|9|@]|A|$K|L]]|$1|U|3|V|5|6|7|1B|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|J|7|1D|8|@]|9|@]|A|$K|L]]|$1|10|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|11|$]]

I went overkill and came up with the following. My motivation behind this was to append to hash keys to avoid scope conflicts when merging together/flattening hashes.

<h2>Examples</h2>

<h3>Extend Hash Class</h3>

Adds rekey method to Hash instances.

<pre class="lang-rb prettyprint-override"><code># Adds additional methods to Hash
class ::Hash
 # Changes the keys on a hash
 # Takes a block that passes the current key
 # Whatever the block returns becomes the new key
 # If a hash is returned for the key it will merge the current hash 
 # with the returned hash from the block. This allows for nested rekeying.
 def rekey
 self.each_with_object({}) do |(key, value), previous|
 new_key = yield(key, value)
 if new_key.is_a?(Hash)
 previous.merge!(new_key)
 else
 previous[new_key] = value
 end
 end
 end
end
</code></pre>

<h3>Prepend Example</h3>

<pre class="lang-rb prettyprint-override"><code>my_feelings_about_icecreams = {
 vanilla: 'Delicious',
 chocolate: 'Too Chocolatey',
 strawberry: 'It Is Alright...'
}

my_feelings_about_icecreams.rekey { |key| "#{key}_icecream".to_sym }
# =&gt; {:vanilla_icecream=&gt;"Delicious", :chocolate_icecream=&gt;"Too Chocolatey", :strawberry_icecream=&gt;"It Is Alright..."}
</code></pre>

<h3>Trim Example</h3>

<pre class="lang-rb prettyprint-override"><code>{ _id: 1, ___something_: 'what?!' }.rekey do |key|
 trimmed = key.to_s.tr('_', '')
 trimmed.to_sym
end
# =&gt; {:id=&gt;1, :something=&gt;"what?!"}
</code></pre>

<h3>Flattening and Appending a "Scope"</h3>

If you pass a hash back to rekey it will merge the hash which allows you to flatten collections. This allows us to add scope to our keys when flattening a hash to avoid overwriting a key upon merging.

<pre class="lang-rb prettyprint-override"><code>people = {
 bob: {
 name: 'Bob',
 toys: [
 { what: 'car', color: 'red' },
 { what: 'ball', color: 'blue' }
 ]
 },
 tom: {
 name: 'Tom',
 toys: [
 { what: 'house', color: 'blue; da ba dee da ba die' },
 { what: 'nerf gun', color: 'metallic' }
 ]
 }
}

people.rekey do |person, person_info|
 person_info.rekey do |key|
 "#{person}_#{key}".to_sym
 end
end

# =&gt;
# {
# :bob_name=&gt;"Bob",
# :bob_toys=&gt;[
# {:what=&gt;"car", :color=&gt;"red"},
# {:what=&gt;"ball", :color=&gt;"blue"}
# ],
# :tom_name=&gt;"Tom",
# :tom_toys=&gt;[
# {:what=&gt;"house", :color=&gt;"blue; da ba dee da ba die"},
# {:what=&gt;"nerf gun", :color=&gt;"metallic"}
# ]
# }

</code></pre>

blocks|key|264383|text|以前的答案已经足够好了，但它们可能会更新原始数据。如果您不希望原始数据受到影响，您可以尝试我的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|264384|+newhash=hash.reject{%7Ck%7C+k=='_id'}.merge({id:hash['_id']})|code-block|syntax|javascript|264385|首先，它将忽略关键字'_id‘，然后与更新后的关键字合并。|264386|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Previous answers are good enough, but they might update original data.
In case if you don't want the original data to be affected, you can try my code.

<pre><code> newhash=hash.reject{|k| k=='_id'}.merge({id:hash['_id']})
</code></pre>

First it will ignore the key '_id' then merge with the updated one.

blocks|key|266631|text|准确回答被问到的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|266632|hash+=+{"_id"=>"4de7140772f8be03da000018"}
hash.transform_keys+{+%7Ckey%7C+key[1..]+}
#+=>+{"id"=>"4de7140772f8be03da000018"}|code-block|syntax|javascript|266633|方法transform_keys从Ruby2.5版开始就存在于Hash类中。|offset|length|style|CODE|266634|https://blog.bigbinary.com/2018/01/09/ruby-2-5-adds-hash-transform_keys-method.html|266635|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|2|E|0|0|2B|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|X|8|@$I|Y|J|Z|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|10|8|@]|9|@$I|11|J|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|N]]]]

Answering exactly what was asked:
<pre><code>hash = {&quot;_id&quot;=&gt;&quot;4de7140772f8be03da000018&quot;}
hash.transform_keys { |key| key[1..] }
# =&gt; {&quot;id&quot;=&gt;&quot;4de7140772f8be03da000018&quot;}
</code></pre>
The method <code>transform_keys</code> exists in the Hash class since Ruby version 2.5.
<a href="https://blog.bigbinary.com/2018/01/09/ruby-2-5-adds-hash-transform_keys-method.html" rel="nofollow noreferrer">https://blog.bigbinary.com/2018/01/09/ruby-2-5-adds-hash-transform_keys-method.html</a>

blocks|key|2962490|text|对于带有transform_keys和delete_prefix+/+delete_suffix方法的Ruby2.5或更新版本：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2962491|hash1+=+{+'_id'+=>+'random1'+}
hash2+=+{+'old_first'+=>+'123456',+'old_second'+=>+'234567'+}
hash3+=+{+'first_com'+=>+'google.com',+'second_com'+=>+'amazon.com'+}

hash1.transform_keys+{+%7Ckey%7C+key.delete_prefix('_')+}
#+=>+{"id"=>"random1"}
hash2.transform_keys+{+%7Ckey%7C+key.delete_prefix('old_')+}
#+=>+{"first"=>"123456",+"second"=>"234567"}
hash3.transform_keys+{+%7Ckey%7C+key.delete_suffix('_com')+}
#+=>+{"first"=>"google.com",+"second"=>"amazon.com"}|code-block|syntax|javascript|2962492|entityMap|0|LINK|mutability|MUTABLE|url|https://ruby-doc.org/core-2.5.0/Hash.html#method-i-transform_keys|1|https://ruby-doc.org/core-2.5.1/String.html#method-i-delete_prefix|2|https://ruby-doc.org/core-2.5.1/String.html#method-i-delete_suffix^0|4|E|0|J|D|1|Z|D|2|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]|$A|Y|B|Z|1|10]|$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]|S|$5|L|M|N|C|$O|T]]]]

For Ruby 2.5 or newer with <a href="https://ruby-doc.org/core-2.5.0/Hash.html#method-i-transform_keys" rel="noreferrer">transform_keys</a> and <a href="https://ruby-doc.org/core-2.5.1/String.html#method-i-delete_prefix" rel="noreferrer">delete_prefix</a> / <a href="https://ruby-doc.org/core-2.5.1/String.html#method-i-delete_suffix" rel="noreferrer">delete_suffix</a> methods:
<pre class="lang-rb prettyprint-override"><code>hash1 = { '_id' =&gt; 'random1' }
hash2 = { 'old_first' =&gt; '123456', 'old_second' =&gt; '234567' }
hash3 = { 'first_com' =&gt; 'google.com', 'second_com' =&gt; 'amazon.com' }

hash1.transform_keys { |key| key.delete_prefix('_') }
# =&gt; {&quot;id&quot;=&gt;&quot;random1&quot;}
hash2.transform_keys { |key| key.delete_prefix('old_') }
# =&gt; {&quot;first&quot;=&gt;&quot;123456&quot;, &quot;second&quot;=&gt;&quot;234567&quot;}
hash3.transform_keys { |key| key.delete_suffix('_com') }
# =&gt; {&quot;first&quot;=&gt;&quot;google.com&quot;, &quot;second&quot;=&gt;&quot;amazon.com&quot;}
</code></pre>

I have a condition where, I get a hash 

<pre><code> hash = {"_id"=&gt;"4de7140772f8be03da000018", .....}
</code></pre>

and I want this hash as

<pre><code> hash = {"id"=&gt;"4de7140772f8be03da000018", ......}
</code></pre>

P.S: I don't know what are the keys in the hash, they are random which comes with an "_" prefix for every key and I want no underscores

How to replace a hash key with another key

我有一个条件，我得到一个哈希值  hash = {"_id"=>"4de7140772f8be03da000018", .....}我希望这个哈希值为  hash = {"id"=>"4de7140772f8be03da000018", ......}P.S：我不知道散列中的关键字是什么，它们是随机的，每个关键字都有一...

问如何用一个哈希键替换另一个哈希键
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