pragma solidity ^0.4.0;
contract Donat{
string[] public jsonList;
string b;
function add(string a) {
jsonList.push(a);
}
function get() returns(string){
for(uint i;i<jsonList.length;i++){
b + =jsonList[i];
}
return b;
}
}
以上代码中
b + =jsonList[i]; 这里报错
browser/23.sol:13:13: ParserError: Expected primary expression.
b + =jsonList[i];
求大神解答