最终效果展示
xhr发起请求
<!DOCTYPE html>
<html lang=\”en\”>
<head>
<meta charset=\”UTF-8\”>
<meta http-equiv=\”X-UA-Compatible\” content=\”IE=edge\”>
<meta name=\”viewport\” content=\”width=device-width, initial-scale=1.0\”>
<title>Document</title>
<link rel=\”stylesheet\” href=\”https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css\” rel=\”external nofollow\” >
<script src=\”https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js\”></script>
<script src=\”https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js\”></script>
</head>
<body>
<!–1、文件选择框 –>
<input type=\”file\” id=\”file1\”>
<!– 2、上传文件的按钮 –>
<button id=\”btnupload\”>上传文件</button>
<br/>
<div class=\”progress\” style=\”width:300px;margin:5px;\”>
<div class=\”progress-bar progress-bar-striped active\” style=\”width: 0%;\” id=\”precent\”>
0%
</div>
</div>
<!– 3、img标签 来显示上传成功以后的图片 –>
<img alt=\”\” id=\”img\” width=\”800\”>
<script>
var precent = document.querySelector(\’#precent\’)
var btnupload = document.querySelector(\’#btnupload\’)
btnupload.addEventListener(\’click\’, function() {
var files = document.querySelector(\’#file1\’).files
if (files.length <= 0) {
return alert(\’请选择要上传的文件\’)
}
var fd = new FormData()
fd.append(\’avatar\’, files[0])
var xhr = new XMLHttpRequest()
xhr.upload.onprogress = function(e) {
console.log(e);
if (e.lengthComputable) {
var h = Math.ceil((e.loaded / e.total) * 100)
precent.style.width = h + \’%\’
precent.innerHTML = h + \’%\’
console.log(h);
}
}
xhr.upload.onload = function() {
$(\’#precent\’).removeClass().addClass(\’progress-bar progress-bar-success\’)
}
xhr.open(\’post\’, \’http://www.liulongbin.top:3006/api/upload/avatar\’)
xhr.send(fd)
xhr.onreadystatechange = function() {
if (xhr.readyState == 4 && xhr.status == 200) {
var data = JSON.parse(xhr.responseText)
console.log(data);
if (data.status == 200) {
console.log(\’上传成功\’);
document.querySelector(\’#img\’).src = \’http://www.liulongbin.top:3006\’ + data.url
} else {
console.log(\’上传失败\’);
}
}
}
})
</script>
</body>
</html>
ajax发起请求
<!DOCTYPE html>
<html lang=\”en\”>
<head>
<meta charset=\”UTF-8\”>
<meta http-equiv=\”X-UA-Compatible\” content=\”IE=edge\”>
<meta name=\”viewport\” content=\”width=device-width, initial-scale=1.0\”>
<title>Document</title>
<script src=\”jquery.js\”></script>
<style>
img {
width: 50px;
height: 50px;
display: none;
}
</style>
</head>
<body>
<input type=\”file\” id=\”file1\”>
<button id=\”btnupload\”>上传文件</button>
</br>
<img src=\”5-121204193R5-50.gif\” alt=\”\” id=\”loading\”>
<script>
$(function() {
$(document).ajaxStart(function() {
$(\’#loading\’).show()
})
$(document).ajaxStop(function() {
$(\’#loading\’).hide()
})
$(\’#btnupload\’).on(\’click\’, function() {
var files = $(\’#file1\’)[0].files
if (files.length <= 0) {
alert(\’请选择文件\’)
}
console.log(\’ok\’);
var fd = new FormData()
fd.append(\’avatar\’, files[0])
$.ajax({
method: \’POST\’,
url: \’http://www.liulongbin.top:3006/api/upload/avatar\’,
data: fd,
processData: false,
contentType: false,
success: function(res) {
console.log(res);
}
})
})
})
</script>
</body>
</html>
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