Le plug-in jQuery imgPreviewQs implémente l'image téléchargée preview_jquery

Télécharger l'aperçu de l'image, prend en charge IE6, IE7, IE8, IE9, IE10, IE11. Firefox et Chrome n'ont pas été spécifiquement testés, mais les versions supérieures sont prises en charge.

imgPreviewQs.js

/*!
  依赖 jQuery 1.5.2 
  (c) 2016 
  license: http://www.opensource.org/licenses/mit-license.php
*/
(function($){
$.fn.imgPreviewQs = function(options){
  function isIE(ver){
    var b = document.createElement('b')
    b.innerHTML = '<!--[if IE ' + ver + ']><i></i><![endif]-->'
    return b.getElementsByTagName('i').length === 1;
  }
   
  options = $.extend( {}, $.fn.imgPreviewQs.defaults,options);
  var $this =$(this);
  $this.change(function(){
    var regex=/(.*)\.(jpg|jpeg|gif|bmp|png)$/;
    var val = $this.val();
    if(!regex.test(val)){
      alert("请选择图片");
      return false;
    }
    if(browserQs.isIE(8)){
      HanderIE789($this);
    }
    else if(window.FileReader){
      HanderFileReader($this);
    }
    else if(browserQs.isIE(9)){
      HanderIE789($this);
    }
    else if(browserQs.isIE(6)){
      HanderOther($this);
    }
    else if(browserQs.isIE(7)){
      HanderIE789($this);
    }
    else{
      $("#"+options.destID).html("浏览器不支持预览图片");
    }
  });
   
  function HanderFileReader($this){
    var oPreviewImg = null, oFReader = new window.FileReader(),
    rFilter = /^(&#63;:image\/bmp|image\/cis\-cod|image\/gif|image\/ief|image\/jpeg|image\/jpeg|image\/jpeg|image\/pipeg|image\/png|image\/svg\+xml|image\/tiff|image\/x\-cmu\-raster|image\/x\-cmx|image\/x\-icon|image\/x\-portable\-anymap|image\/x\-portable\-bitmap|image\/x\-portable\-graymap|image\/x\-portable\-pixmap|image\/x\-rgb|image\/x\-xbitmap|image\/x\-xpixmap|image\/x\-xwindowdump)$/i;
    oFReader.onload = function (oFREvent) 
    {
      $("#"+options.destID).html("<img src='"+oFREvent.target.result+"' style='width:100%;height:100%;'/>");
    };
     
    var aFiles = $this.get(0).files;
    if (aFiles.length === 0) { return; }
    if (!rFilter.test(aFiles[0].type)) { alert("请选择图片"); return; }
    oFReader.readAsDataURL(aFiles[0]);
  }
   
  function HanderIE789($this){
    $("#"+options.destID).css("filter","progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src='"+getUrl($this)+"')");
  }
   
  function HanderOther($this){
    $("#"+options.destID).html("<img src='"+$this.val()+"' style='width:100%;height:100%;'/>");
  }
   
  function getUrl($this){
    $this.select();
    $this.blur();
    var imgSrc =document.selection.createRange().text;
    document.selection.empty();
    return imgSrc;
  }
}; 
$.fn.imgPreviewQs.defaults = {
    destID:""
};
})(jQuery);