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這篇文章給大家介紹Solidity中怎么利用returns函數(shù)接收多個(gè)值，內(nèi)容非常詳細(xì)，感興趣的小伙伴們可以參考借鑒，希望對(duì)大家能有所幫助。
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函數(shù)返回多個(gè)值
// 函數(shù)可以返回多個(gè)值
function multipleReturns() returns(uint a, uint b, uint c) {
return (1, 2, 3);
}同時(shí)接收所有返回值
function processMultipleReturns() {
uint a;
uint b;
uint c;
// 這樣來(lái)做批量賦值:
(a, b, c) = multipleReturns();
}只接收部分返回值
// 或者如果我們只想返回其中一個(gè)變量:
function getLastReturnValue() {
uint c;
// 可以對(duì)其他字段留空:
(,,c) = multipleReturns();
}項(xiàng)目中實(shí)際碰到問(wèn)題
function multipleReturns() returns(string memory a, uint b, uint c) {
return ("1", 2, 3);
}
function processMultipleReturns() {
string memory a;
uint b;
uint c;
// 這樣來(lái)做批量賦值:
(a, b, c) = multipleReturns();
} mapping (uint256 => Tree) public dnaToTree;
//通過(guò) Dna 獲取加密資產(chǎn)詳情
function getTreeByDna(uint256 _Dna) public constant returns(string memory treeByDna_user , uint256 treeByDna_dna,string memory treeByDna_treeName, uint64 treeByDna_birthTime, uint256 treeByDna_needFooder, bytes32 treeByDna_status, bool treeByDna_isAdult) {
return (dnaToTree[_Dna].user, dnaToTree[_Dna].dna, dnaToTree[_Dna].treeName, dnaToTree[_Dna].birthTime, dnaToTree[_Dna].needFooder ,dnaToTree[_Dna].status ,dnaToTree[_Dna].isAdult);
}
function getTreeByDna_d(uint256 _Dna) public constant {
string memory treeByDna_user;
uint256 treeByDna_dna;
string memory treeByDna_treeName;
uint64 treeByDna_birthTime;
uint256 treeByDna_needFooder;
bytes32 treeByDna_status;
bool treeByDna_isAdult;
(treeByDna_user, treeByDna_dna, treeByDna_treeName, treeByDna_birthTime, treeByDna_needFooder, treeByDna_status, treeByDna_isAdult) = getTreeByDna(_Dna);
}關(guān)于Solidity中怎么利用returns函數(shù)接收多個(gè)值就分享到這里了，希望以上內(nèi)容可以對(duì)大家有一定的幫助，可以學(xué)到更多知識(shí)。如果覺(jué)得文章不錯(cuò)，可以把它分享出去讓更多的人看到。
