jquery在文本框中检索值并放入php变量？

I need to get the value inside a textbox without refresh so i can execute an sql statement based on it.

If you're using jQuery, you can use the function .val(), then .post() to perform a HTTP post to a PHP page. You can then access the value from the PHP array $_POST.

Javascript is a client-side language, while PHP is server-sided. The variable can be passed using AJAX, which jQuery .post() is sufficient for.

//fetch the value of div "input"
var value = $(#'input').val();

//perform a HTTP post
$.post("dest_page.php", {
  input: value
});

Then access in PHP.

$input = $_POST['input'];

A really super-easy way is to do a jQuery .load() on an event firing. This might be a button click or on .keyup() event.

$('#txtBox').keyup(function(){
    //COLLECT TXTBOX VALUE
    var value=$('#txtBox_selector').val()
    //SEND VALUE TO SERVER FOR ... WHATEVER YOU WANT TO DO WITH IT
    $('#your_selector').html('Loading...').load('path/to/script','value='+value);
})

Hope this helps.