flutter json 去除[]

实际是数组的问题

var set1 = new Set();

  set1.add("123");

  set1.add("345");

 

//toList 其他类型转换成List

  var L2 = set1.toList();

  print(L2);

//join 把List转换成字符串

  var str = L2.join("");

  print(str);

//split 把字符串转换成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("")