基于javascript代码实现通过点击图片显示原图片_javascript技巧

废话不多说了，直接给大家贴js实现点击图片显示原图片的代码，具体代码如下所示：

function DrawImage(ImgD){
  var image = new Image();
  image.src=ImgD.src;
  var width = $(ImgD).attr("width");
  var height = $(ImgD).attr("height");
  if(width >100 && height>80){
    ImgD.width=100; 
    ImgD.height=80;
    ImgD.alt=image.width+"×"+image.height;
  }else{
    if(image.width>0 && image.height>0){
      flag=true;
      if(image.width>300 || image.height>200){
        ImgD.width=image.width/2; 
        ImgD.height=image.height/2;
        ImgD.alt=image.width+"×"+image.height;
      }else{
        ImgD.width=image.width;  
        ImgD.height=image.height;
        ImgD.alt=image.width+"×"+image.height;
      }
    }
  }
}

下面分享一段关于js实现上传图片及时预览

"; } } function clacImgZoomParam( maxWidth, maxHeight, width, height ){ var param = {top:0, left:0, width:width, height:height}; if( width>maxWidth || height>maxHeight ) { rateWidth = width / maxWidth; rateHeight = height / maxHeight; if( rateWidth > rateHeight ) { param.width = maxWidth; param.height = Math.round(height / rateWidth); }else { param.width = Math.round(width / rateHeight); param.height = maxHeight; } } param.left = Math.round((maxWidth - param.width) / 2); param.top = Math.round((maxHeight - param.height) / 2); return param; }