FormData 表单数据对象，这是在HTML5中新增的一个API，他能以表单对象做参数，自动的将表单的数据打包，当ajax发送数据是，发送FormData内的表单数据给后端即可
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <script> function fd(){ var fdate = document.getElementById('fdate'); var fd = new FormData(fdate); var xhr = new XMLHttpRequest(); xhr.open('post','10.php',true); xhr.send(fd); xhr.onreadystatechange = function(){ if(this.readyState == 4){ document.getElementById('desc').innerHTML = this.responseText; } } } </script> <body> <form id="fdate" > user:<input type="text" name="user"> <br><br> age:<input type="text" name="age"> <br><br> sex:<input type="text" name="sex"> <br><br> QQ:<input type="text" name="QQ"> <br><br> <input type="button" value="Go" onclick="fd();"> </form> <p id="desc"></p> </body> </html>
效果如下所示：
这样比传统的拼接方法简单多了，当然他还有另外一种用法，如下所示：
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <script> function fd(){ var fdate = document.getElementById('fdate'); var fd = new FormData(fdate); var fd2 = new FormData(); var xhr = new XMLHttpRequest(); xhr.open('post','10.php',true); //xhr.send(fd); fd2.append('user','leigood'); fd2.append('age','18'); xhr.send(fd2); xhr.onreadystatechange = function(){ if(this.readyState == 4){ document.getElementById('desc').innerHTML = this.responseText; } } } </script> <body> <form id="fdate" > user:<input type="text" name="user"> <br><br> age:<input type="text" name="age"> <br><br> sex:<input type="text" name="sex"> <br><br> QQ:<input type="text" name="QQ"> <br><br> <input type="button" value="Go" onclick="fd();"> </form> <p id="desc"></p> </body> </html>
效果如下所示：
