Chrome扩展程序：未插入或提取数据

I am using WebSQL. I am trying to add data in Async Block which is making data not to be inserted. Code is given below:

我正在使用WebSQL。我试图在异步块中添加数据,这使得数据无法插入。代码如下:

function fetchData(){

    var xhr = new XMLHttpRequest();
    xhr.open("GET", "http://localhost/x/fetch.php", true);
    xhr.onreadystatechange = function() {
        if (xhr.readyState == 4) {
            // JSON.parse does not evaluate the attacker's scripts.
            var resp = xhr.responseText;
            if(resp != null) {
                var json = JSON.parse(resp)
                console.log(resp);
                var data = json['data'];
                if(data != null) {
                    openDatabase('documents', '1.0', 'documents', 5*1024*1024, function (db) {
                        alert('Called'); // This is called after below two calls.
                        insertRecord(db);
                        fetchRecord(db);
                    });
                    //var dbConnection = openDbConnect();
                    //createTable(dbConnection);

                    for(var a=0;a <= data.length;a++) {
                        alert(data[a].title);
                    }
                }

            }

        }
    }
    xhr.send();
}

JSON Dump

{"data":[{"id":"1","title":"- Parts I & II”,”CODE”:”xxx”,”product_url":"http:\/\/www.example.com","image_url":"http:\/\/ecx.images-example.com\/images\/I\/61ujIIMyW7L.jpg","price":"$25.00"},{"id":"2","title”:”AJDJDDJDr”,”Code”:”XX”,”product_url":"http:\/\/www.example.com","image_url":"http:\/\/dc.images-example.com\/images\/I\/41jFVZL72YL.jpg","price":"$10.99"}]}

1 个解决方案

#1

Try this ;)

试试这个 ;)

Problem in this loop condition:

此循环条件中的问题:

for(var a = 0; a <= data.length; a++) {
                  ^

Here you are starting from 0 and looping to data.length

在这里,您从0开始并循环到data.length

So to loop with arrays as array index starts from 0 loop till a <= data.length - 1 OR a < data.length

所以要循环使用数组作为数组索引从0循环开始直到<= data.length - 1或

for(var a = 0; a < data.length; a++) {

for(var a=0; a <= (data.length - 1); a++) {

Instead of for loop you can use for...in like this:

而不是for循环,你可以使用...像这样:

for(var index in data){
  alert(data[index].title);
}

#1