Question

firebug抱怨它存在语法错误

if (document.getElementById("fromAddress").value == "") || 
(document.getElementById("fromAddress").value == "Enter Address, City, Directions") {

Answer 1

你缺少括号，据说你最好这样写。

var from = document.getElementById("fromAddress").value;
if (from  === "" || from  === "Enter Address, City, Directions") {

Answer 2

您需要在parans中包含整个条件语句：

if ( (blah) || (blah) )
   ^                  ^
{
  // as you were
}

Answer 3

你有 括号错误 ，试试这个：

if ((document.getElementById("fromAddress").value == "") || 
(document.getElementById("fromAddress").value == "Enter Address, City, Directions")){...}

Answer 4

更正后的表格:(删除了2个括号）

if（document.getElementById（“fromAddress”）。value ==“”|| document.getElementById（“fromAddress”）。value ==“输入地址，城市，方向”）{

这个JS有什么问题

4 个答案: