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                            ## FileReader對象
HTML5新增內建對象,可以讀取本地文件內容.
```
<body>
<input type="file" id="file" multiple>
<script>
    var file = document.getElementById('file');
    file.onchange = function () {            
        var reader = new FileReader();

        reader.readAsText(this.files[0]);        //如果是讀取文件,最好是utf-8字符集的,或者可以指定字符集讀取,到網上查.

        reader.onload = function () {        //讀取完成之后
            console.log(this.result);       //result是固定寫法
        }
    }
</script>
```
## 讀取文件
```
<body>
<input type="file" id="file" multiple>
<img src="" alt="" id="img">
<script>
    var file = document.getElementById('file');
    var img = document.getElementById('img');
    file.onchange = function () {
        var reader = new FileReader();

        reader.readAsDataURL(this.files[0]);

        reader.onload = function () {
            img.src = this.result   //讀取到的是base64
        }
    }
</script>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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