解决方法
您可以使用FileReader.readAsDataURL()轻松地执行此操作.用户选择图像,您可以显示它,而无需上传它.
欲了解更多信息,请参阅https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsDataURL
这是代码:
function previewFile() { // Where you will display your image var preview = document.querySelector('img'); // The button where the user chooses the local image to display var file = document.querySelector('input[type=file]').files[0]; // FileReader instance var reader = new FileReader(); // When the image is loaded we will set it as source of // our img tag reader.onloadend = function () { preview.src = reader.result; } if (file) { // Load image as a base64 encoded URI reader.readAsDataURL(file); } else { preview.src = ""; } }
<input type="file" onchange="previewFile()"><br> <img src="" height="200" alt="Image preview...">