# Solidity中一种高效通过代码减少gas消耗的方法

**Published by:** [Renaissance Labs](https://paragraph.com/@renaissance-labs/)
**Published on:** 2022-03-01
**URL:** https://paragraph.com/@renaissance-labs/solidity-gas

## Content

ART主要是通过代码中memory来大幅度减少gas使用，示例代码如下：pragma solidity ^0.5.10; contract Test{ struct User{ uint age; uint balance; uint num; } User user; function initUser() public{ user = User({age:20,balance:1000,num:1}); } function setUser1() public { user.age = 30; user.balance = 20000; user.num = 2; } function setUser2() public { User memory temp = user; temp.age = 40; temp.age = 20001; user.num = 3; user = temp; } } pragma solidity ^0.5.10; contract Test{ struct User{ uint age; uint balance; uint num; } User user; function initUser() public{ user = User({age:20,balance:1000,num:1}); } function setUser1() public { user.age = 30; user.balance = 20000; user.num = 2; } function setUser2() public { User memory temp = user; temp.age = 40; temp.age = 20001; user.num = 3; user = temp; } } 我们首先通过initUser方法来初始化一个User对象的数据，然后分别调用setUser1和setUser2两个方法。 你会发现，setUser1需要消耗36476gas，而setUser2只需要效果31595gas，它们的效果相同，消耗的gas却差了5000gas，如果User的字段增多，那么此差距会越来越大。 那么这两种写法的区别是什么呢？我们知道，区块链上的写操作是比较昂贵的，而setUser1进行了多次的写操作，而setUser2只进行了一次整体的写操作。因此，节省了相当大一部分的gas。

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