方法一：FileReader()

<input type="file" id="fileInput" /><script>const fileInput = document.getElementById('fileInput')fileInput.addEventListener('change', function (e) {const file = e.target.files[0]const reader = new FileReader()reader.onload = function (event) {const text = event.target.resultconsole.log(text)}reader.readAsText(file, 'GB2312')})
</script>

方法二：fetch()

<input type="file" id="fileInput" /><script>const fileInput = document.getElementById('fileInput')fileInput.addEventListener('change', function (e) {const file = e.target.files[0]fetch(file).then((res) => res.arrayBuffer()).then((fileContent) => {const decoder = new TextDecoder('GB2312')const text = decoder.decode(fileContent)console.log(text)}).catch((error) => {console.log(error)})})
</script>

相关URL方法

URL.createObjectURL('文件') 可以输出一个文件的临时url

javascript">let file_path = URL.createObjectURL('文件')