js图片上传的封装代码

function uploadImages(picker, url, callback) {
 var img_uploader = WebUploader.create({
 auto: true,
 server: url,
 pick: picker,
 fileNumLimit: 1,
 fileSingleSizeLimit: 2097152, // 2M
 accept: {
 title: 'Images',
 extensions: 'gif,jpg,jpeg,bmp,png',
 // mimeTypes: 'image/*'
 },
 compress: {
 width: 300,
 compressSize: 102400 // < 100kb 不压缩
 },
 })

 var fileType = ['image/jpeg', 'image/jpg', 'image/gif', 'image/png', 'image/bmp']

 img_uploader.on('beforeFileQueued', function(file) {

 fileType.some(function(name) {
 return file.type === name
 })

 ? '' : alert('请上传正确的图片！')

 })

 img_uploader.on('uploadSuccess', function(file, res) {
 callback(file, res)
 })

 img_uploader.on('uploadError', function(file, reason) {
 console.log(reason);
 })

 img_uploader.on('uploadComplete', function(file) {
 img_uploader.reset()
 })

}

<div id="zTu">图片</div>

var coverImage; 
initImageUploader();
function initImageUploader(){
 var fileUrl = 你想上传的地址;
 uploadImages('#imagePicker', fileUrl, function(file, res) {
 coverImage = res.url
 $('#zTu').get(0).innerHTML = '<div class="file-item thumbnail"><img style="max-height:180px" src="' + res.url + '" /></div>'
 })
 }