Html 选择WebSQL时出错

我在尝试从本地websql数据库获取select时遇到问题

我有一张名为“客户”的桌子。这是我的密码：

var db = openDatabase("test", "", "", 1024*1024);
db.transaction(function (tx) {
     tx.executeSql('SELECT * FROM clientes', [], function (tx, results) {
        var len = results.rows.length;
        for (i = 0; i < len; i++) {                 
            console.log(results.rows.item(i));
        }
    });         
})

但当我尝试用一个未定义的

db.transaction(function (tx) {
     tx.executeSql('SELECT * FROM clientes WHERE ClienteCiudad="Madrid"', [], function (tx, results) {
        var len = results.rows.length;
        for (i = 0; i < len; i++) {                 
            console.log(results.rows.item(i));
        }
    });         
})

db.事务（功能（tx）{
tx.executeSql（'SELECT*FROM clientes WHERE ClienteCiudad=“Madrid”'，[]，函数（tx，结果）{
var len=results.rows.length；
对于（i=0；i

有人能帮我吗

谢谢

请尝试以下代码

db.transaction(function (tx) {
      var searchfor = "Madrid";
      tx.executeSql('SELECT * FROM clientes WHERE ClienteCiudad=?', [searchfor], function (tx, results) {
         var len = results.rows.length;
         for (i = 0; i < len; i++) {                 
             console.log(results.rows.item(i));
          }
       });         
})

db.事务（功能（tx）{
var searchfor=“马德里”；
tx.executeSql（'SELECT*FROM clientes WHERE ClienteCiudad=？'，[searchfor]，function（tx，results）{
var len=results.rows.length；
对于（i=0；i

db.transaction(function (tx) {
      var searchfor = "Madrid";
      tx.executeSql('SELECT * FROM clientes WHERE ClienteCiudad=?', [searchfor], function (tx, results) {
         var len = results.rows.length;
         for (i = 0; i < len; i++) {                 
             console.log(results.rows.item(i));
          }
       });         
})