ajax图片上传

使用AJAX实现图片上传，你可以创建一个表单并使用JavaScript的FormData对象来构建和发送POST请求。以下是一个简单的实现示例：

HTML部分：

<form id="uploadForm">
    <input type="file" name="image" id="image" />
    <input type="button" value="Upload" onclick="uploadImage()" />
</form>
<div id="status"></div>

JavaScript部分：

function uploadImage() {
    var formData = new FormData();
    var imageFile = document.getElementById('image').files[0];
    formData.append('image', imageFile);
 
    var xhr = new XMLHttpRequest();
    xhr.open('POST', 'upload.php', true);
 
    xhr.onload = function() {
        if (this.status == 200) {
            document.getElementById('status').innerHTML = this.responseText;
        }
    };
 
    xhr.send(formData);
}

PHP部分 (upload.php):

<?php
if ($_FILES['image']['error'] == UPLOAD_ERR_OK) {
    $tmpName = $_FILES['image']['tmp_name'];
    $name = $_FILES['image']['name'];
    move_uploaded_file($tmpName, "uploads/$name");
    echo "File uploaded successfully.";
} else {
    echo "Upload failed with error: " . $_FILES['image']['error'];
}
?>

确保服务器配置允许通过POST方法上传文件，并且upload.php文件存在于服务器上，且有适当的权限。