1、+ 运算符
var str1:String = "green"; var str2:String = "ish"; var str3:String = str1 + str2; trace(str3); //greenish
2、+= 运算符
var str:String = "green"; str += "ish"; trace(str); //greenish
3、concat方法
var str1:String = "Bonjour"; var str2:String = "from"; var str3:String = "Paris"; var str4:String = str1.concat(" ", str2, " ", str3); trace(str4); // Bonjour from Paris