js下载

下载用ajax不好使,得用表单提交的方式

download:function(url,paramObj){var doc = document;//使用一个隐藏的form表单执行提交，没有则创建var downloadForm = doc.getElementById('_downloadForm');if(!downloadForm){downloadForm = doc.createElement('form');downloadForm.id = '_downloadForm';doc.body.appendChild(downloadForm);//必须加入body中，否则可能不下载}downloadForm.method = 'post';downloadForm.action = url;downloadForm.style.display='none';//隐藏downloadForm.target='_blank';//移除之前表单内的所有域while(downloadForm.hasChildNodes()){downloadForm.removeChild(downloadForm.firstChild);}//根据传入的参数，创建表单隐藏域if(paramObj != null){var hidden;for(var key in paramObj){ if(paramObj[key]==null || paramObj[key] == undefined){continue;}hidden = doc.createElement('input');hidden.type='hidden';hidden.name = key;hidden.value = paramObj[key];downloadForm.appendChild(hidden);} }downloadForm.submit();//提交，执行下载}