ajax上传图片 

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <title>Page Title</title>
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
    </head>
    <body>
        <form action="" method="">
            <label>
                <input type="file" onchange="upfile(this, '#form01234');PreviewImage(this, 'file0123');" />
                <div id="file0123"></div>
                <input type="hidden" name="ico" id="form01234" />
            </label>
        </form>
        <script>
            const url = "index.php";  //处理图片的接口

            //选中图片预览
            function PreviewImage(imgFile, id) {
                if (imgFile.value != undefined) {
                    var ext = imgFile.value.substring(imgFile.value.lastIndexOf(".")).toLowerCase();
                    if (!ext.match(/(?:jpg|jpeg|gif|png|bmp)$/)) {
                        imgFile.focus();
                        return;
                    }
                    document.getElementById(id).innerHTML =
                        '<img width="100%" src="' + window.URL.createObjectURL(imgFile.files[0]) + '" />';
                }
            }

            function upfile(file, form) {
                var formData = new FormData();
                formData.append("file", $(file)[0].files[0]);
                $.ajax({
                    url,
                    type: "POST",
                    data: formData,
                    processData: false, // 告诉jQuery不要去处理发送的数据
                    contentType: false,
                    AccessControlAllowOrigin: "*", // 告诉jQuery不要去设置Content-Type请求头
                    beforeSend: function() {
                        console.log("正在进行，请稍候");
                    },
                    success: function(data) {
                        var json = JSON.parse(data);
                        $(form).val(json["url"]);
                    },
                    error: function(data) {
                        console.log("上传失败");
                    }
                });
            }
        </script>
    </body>
</html>

 

posted @ 2019-01-25 20:33  我爱大西瓜  阅读(212)  评论(0)    收藏  举报