隐藏inputtype=file后，用click()方法弹出附件弹窗

1、jsp标签，俩个标签距离无所谓，第一个隐藏

<input type="file" class="hide" id="pictureFileId"> 

<span class="webim-picture-icon">点击上传</span>

2、js操作-在调用click（）之前需要恢复input的value为“”

$(document).on('click', '.webim-picture-icon', function(event){
event.preventDefault();
console.log("1"+$("#pictureFileId").val());

$("#pictureFileId").val("");//恢复默认后才可以调用下边change

console.log("2"+$("#pictureFileId").val());

$("#pictureFileId").click();


});
$("#pictureFileId").change(function(){

console.log("3"+$("#pictureFileId").val());

sendPrivateImg();

});
// 单聊发送图片消息
var sendPrivateImg = function () {
console.log('onFileUploadComplete');

｝

参考播客：

http://blog.youkuaiyun.com/u013688040/article/details/19401789

http://blog.youkuaiyun.com/microandsmall/article/details/60326487