JavaScript字符串拼接基础：+、+=、concat及换行处理

   var longString = "One piece " + "plus one more piece."; 

   var result = "";


   result += "My name is Anders"


   result += " and my age is 25"; 

   var confirmString = "You did not enter a response to the last " +
    "question.Submit form anyway?";


   var confirmValue = confirm(confirmString);

   var htmlString = "First line of string.<br>Second line of string.";


   document.write(htmlString);

   string.concat(value1, value2, ...)