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Introduction to the method of asynchronously uploading image files in javascript

巴扎黑
巴扎黑Original
2017-07-24 16:53:031533browse
html:
        
 
 
jquery:
$("#addfile").on('change', function () {
    var f = $(this).get(0).files[0];
    var form = document.getElementById('myform');
    var formData = new FormData(form);
    formData.append('Filedata', f);
    var xhr = new XMLHttpRequest();
    xhr.addEventListener("load", uploadComplete, false);
    xhr.addEventListener("error", uploadFailed, false);
    xhr.open('POST', form.action);
    xhr.send(formData);
});
function uploadComplete(evt)
{
    var data=evt.target.responseText
}
function uploadFailed()
{
    alert("上传失败!请重试!"); 
}

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