JS实现多张图片预览同步上传功能

/** * Created by liujing on 2017/5/10. */$(document).ready(function($) {  function changef(which,bulk,name_n){    var bulka = bulk;    var thisid = which.attr("id");    var f = which.prop ('files')[0];    var filename = f.name;    var mime = filename.toLowerCase().substr(filename.lastIndexOf("."));    var liid = $("#"+thisid).closest("li").attr("id");    var liidb = parseInt(liid)+1;    if(mime==".jpg" || mime==".png"){      var src = window.URL.createObjectURL(f);      var name = $("#logo"+liid).val().split("//").pop();      $('#logotips'+liid).css({"background":'url('+src+')','backgroundSize':100+'%'});      $('#up_flower'+liid).empty().append(name);      $('#'+liid).append('<a class="edit_text">✖</a>');      bulka.append('<li class="uploading" id="'+liidb+'"><a class="a_a" id="logotips'+liidb+'"><input class="input_hide logo'+liidb+'" type="file" name="'+name_n+'" id="logo'+liidb+'"></a></li>');      $('#logotips'+liidb).css({"background":'url("../../img/c_up.png")','backgroundSize':100+'%'});    }    $('.logo'+liid).addClass("newc"+liid);    $('.newc'+liid).removeClass("logo"+liid);    $('.newc'+liid).on('change',function(){      var files = $(this).prop('files')[0];      var srcb = window.URL.createObjectURL(files);      var liid = $("#"+thisid).closest("li").attr("id");      var liidb = parseInt(liid)+1;      var name = $("#logo"+liid).val().split("//").pop();      $('#logotips'+liid).css({"background":'url('+srcb+')','backgroundSize':100+'%'});      $('#up_flower'+liid).empty().append(name);    })    $('.edit_text').on('click',function(){      $(this).parent().remove();    })  }   function changelast(which ,bulk){    var bulka = bulk;    var thisid = which.attr("id");    var f = which.prop ('files')[0];    var filename = f.name;    var mime = filename.toLowerCase().substr(filename.lastIndexOf("."));    var liid = $("#"+thisid).closest("li").attr("id");    var liidb = parseInt(liid)+1;    if(mime==".jpg" || mime==".png"){      var src = window.URL.createObjectURL(f);      var name = $("#logo"+liid).val().split("//").pop();      $('#logotips'+liid).css({"background":'url('+src+')','backgroundSize':100+'%'});      $('#up_flower'+liid).empty().append(name);      $('#'+liid).append('<a class="edit_text">✖</a>');    }    $('.logo'+liid).addClass("newc"+liid);    $('.newc'+liid).removeClass("logo"+liid);    $('.newc'+liid).on('change',function(){      var files = $(this).prop('files')[0];      var srcb = window.URL.createObjectURL(files);      var liid = $("#"+thisid).closest("li").attr("id");      var liidb = parseInt(liid)+1;      var name = $("#logo"+liid).val().split("//").pop();      $('#logotips'+liid).css({"background":'url('+srcb+')','backgroundSize':100+'%'});      $('#up_flower'+liid).empty().append(name);    })    $('.edit_text').on('click',function(){      $(this).parent().remove();    })  }     $(".logo1").one("change",function(){      that = $(this); var bulk = $("#add_beo"); var name = $(this).attr('name'); changef(that,bulk,name);    });    $("#add_beo").one("change",".logo2",function(){      that = $(this); var bulk = $("#add_beo"); var name = $(this).attr('name'); changef(that,bulk,name);    });    $("#add_beo").one("change",".logo3",function(){      that = $(this); var bulk = $("#add_beo"); var name = $(this).attr('name'); changef(that,bulk,name);    });    $("#add_beo").one("change",".logo4",function(){      that = $(this); var bulk = $("#add_beo"); var name = $(this).attr('name'); changef(that,bulk,name);    });    $("#add_beo").one("change",".logo5",function(){      that = $(this); var bulk = $("#add_beo"); changelast(that , bulk);    });});