web fileReader API

1. code
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>WEB FILEREADER API</title>
  <style type="text/css">
   

  </style>
</head>
<body onClick="showFileName()">
    <input name="t"type = file id = 'file'/>
    
    <input type = button onclick = 'readImg()' value = '读取图像'/> 
    <input type = button onclick = 'readFile()' value = '读取文件'/>
    <div id = 'result'></div>
    <script language = 'javascript'>
      function showFileName(){
        var files = document.getElementById('file').files;
        var file;
        console.log(files)
        //console.log(1)
        for(var i = 0, len = files.length; i < len; i++){
          file = files[i];
          console.log(1)
          console.log(file.name);
        }
      }
      showFileName()

      function readImg(){
        var file = document.getElementById('file').files[0];
        console.log(file)
        if(!/image/w+/.test(file.type)){
          alert("请确保文件为图像类型！");
          return false;
        }
        var reader = new FileReader();
        reader.readAsDataURL(file);
        reader.onload = function(e){
            console.log(this)
          var result = document.getElementById('result');
          result.innerHTML = "<img src = '"+this.result+"' alt = ''/>";
        };
      }

      function readFile(){
        var  file = document.getElementById('file').files[0];
        var reader = new FileReader();
        reader.readAsText(file);
        reader.onload = function(f){
          var result = document.getElementById('result');
          result.innerHTML = this.result;
        }
      }

    </script>
</body>
</html>
2. pic
3. end