上传文件/并预览/上传多个文件
原理:在于input标签中的;fileReader会显示;
html:
<input id="browse" type="file" onchange="previewFiles()" multiple>
<div id="preview"></div>
js代码:
function previewFiles() {
var preview = document.querySelector('#preview');
var files = document.querySelector('input[type=file]').files;
function readAndPreview(file) {
// Make sure `file.name` matches our extensions criteria
if ( /\.(jpe?g|png|gif)$/i.test(file.name) ) {
var reader = new FileReader();
reader.addEventListener("load", function () {
var image = new Image();
image.height = 100;
image.title = file.name;
image.src = this.result;
preview.appendChild( image );
}, false);
reader.readAsDataURL(file);
}
}
if (files) {
[].forEach.call(files, readAndPreview);
}
}