Javascript限制文件上传输入文件的数量

Question

I want to limit the number of files uploaded to 3. Im new on this, so please anyone can help? 我想限制上传到3的文件数量。我是新的，所以请任何人都可以帮忙吗？

Here my code: 这是我的代码：

 $('#fileinput').change(function(){ if(this.files.length>3) alert('to many files') });

 <input id="fileinput" type="file" name="fileUpload" multiple="multiple"/>

Answer 1

What you have generally works in a browser supporting the files apis. 你通常在支持文件apis的浏览器中工作。 Here's your code, made to work: 这是你的代码，工作：

$(document).ready(function() {
  $('#fileinput').change(function() {
    if (this.files.length > 3)
      alert('to many files')
  });
});