實際是數組的問題數組
var set1 = new Set();spa
set1.add("123");orm
set1.add("345");token
//toList 其餘類型轉換成List字符串
var L2 = set1.toList();string
print(L2);it
//join 把List轉換成字符串io
var str = L2.join("");ast
print(str);function
//split 把字符串轉換成List
var str2 = "1-2-3-4-5";
var L3 = str2.split('-');
print(L3);
/*
[123, 345]
123345
[1, 2, 3, 4, 5]
*/
print(newTitle['content']);//打印title的值
print(newTitle['fromId'].join(""));
print(newTitle['toId'].join(""));
.join("")