图片上传功能制作——2018年4月19日 - 课程作业

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实例

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>图片上传测试</title>
</head>
<body>
	<form id="picupload" enctype="multipart/form-data">
			<fieldset>
				<legend>上传测试</legend>
				<label for='file'></label><input type="file" name="file" id='file'>
				<p><button type='submit' name='submit' id='submit'>上传</button></p>
				
				
			</fieldset>
		

	</form>
	
</body>
</html>

<script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.js"></script>
<script type="text/javascript">
  
$('#submit').click(function(){
	var pic = new FormData();
    pic.append("file", $("#file").get(0).files[0]);

      $.ajax({
        url:'upload.php',
        type:"post",
        processData: false,
        contentType: false,
        data:pic,
        dataType:'json',
        success:function(res){  
        	
        	$('span').remove()
        	// $('p').after('<span>').next().html(res).css('color','green')
        	switch(res.status){
        		case 0:
        		$('p').after('<span>').next().html(res.msg).css('color','green')
        		break
        		case 1:
        		$('p').after('<span>').next().html(res.msg).css('color','red')
        		break
        		case 2:
        		$('p').after('<span>').next().html(res.msg).css('color','red')
        		break
        		case 3:
        		$('p').after('<span>').next().html(res.msg).css('color','red')
        		break
        	}
		}
      })
return false
})

</script>

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实例

<?php


$randname =date('Hms');
$randname .= rand(0,999)*rand(0,999).'.jpg';
$allow = ['image/jpg','image/jpeg','image/png'];

$name = $_FILES['file']['name'];
$type = $_FILES['file']['type'];
$size = $_FILES['file']['size'];
$tmp_name = $_FILES['file']['tmp_name'];
$error = $_FILES['file']['error'];

if ($_SERVER['REQUEST_METHOD']=='POST') {
	if (isset($_FILES['file'])) {
		if(in_array($type,$allow)){
			if ($size < (1024*50)) {
				move_uploaded_file($tmp_name,'upload/'.$randname);

				exit(json_encode(['status'=>0,'msg'=>'图片上传成功']));


				
			}else{
				exit(json_encode(['status'=>1,'msg'=>'文件尺寸不得大于50KB！']));
			}
		}else{
			exit(json_encode(['status'=>2,'msg'=>'不支持此类型文件上传！']));
		}
	}else{
		exit(json_encode(['status'=>3,'msg'=>'文件没有选择！']));
	}
}

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