函數功能：實作主流瀏覽器的檔案下載功能;
相容性： >=IE10,Edge,chrome,firefox;
與後台的請求方式：GET請求， url攜帶參數 url？ id=123(隱藏檔案真實路徑)；
實作下載功能的前提是判斷瀏覽器類型：
##
browserType: function(){var userAgent = navigator.userAgent.toLowerCase();// Figure out what browser is being usedvar testCenter = {
ie:function isIE() { //ie?if (!!window.ActiveXObject || "ActiveXObject" in window)return true;elsereturn false;
},
edge : ()=>{ return /dge/.test(userAgent) },
chrome:()=>{ return /chrome/.test(userAgent)},
safari: ()=>{ return /safari/.test(userAgent)&&!(/chrome/.test(userAgent))},
opera: ()=>{ return /opera/.test(userAgent) } ,
msie: ()=>{ return /msie/.test(userAgent) && !/opera/.test(userAgent) },
mozilla: ()=>{ return /mozilla/.test(userAgent) && !/(compatible|webkit)/.test(userAgent) }
};var browserObj = {};for(var k in testCenter){var result = testCenter[k]();var version = (userAgent.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [])[1];if(result){
browserObj.browser = k;
browserObj.version = version;return browserObj;
}
}
},
#dlFile ： function(options) {var that = this;var url = options.url;
url += "?" + $.param(options.data); //这里也可以不用jqvar xhr = new XMLHttpRequest(); //发起请求xhr.open('get', url);
xhr.responseType = 'blob'; //规定响应为流文件 xhr.send();
xhr.onreadystatechange = function(){if (this.readyState == 4){if (this.status == '401' || this.status == '402') { //在这里可以进行一些请求失败的处理 }else if(this.status == 200) {var currentBrowserType = that.browserType(); //判断浏览器类型 见上述browserType函数；if(currentBrowserType.browser==='ie'&&(currentBrowserType.version == "10.0" || currentBrowserType.version == "11.0")){ //如果IE创建iframe对象来下载var href = window.URL.createObjectURL(this.response);var elemIF = document.createElement("iframe");
elemIF.src = "http://" + location.host + '/crowd-web/file/downloadFile?' + $.param(options.data);
elemIF.style.display = "none";
document.body.appendChild(elemIF);
}else if( currentBrowserType.browser==='edge'){ //如果edge使用h5的a标签的下载功能实现if (this.getResponseHeader("content-disposition")) {var fileName = decodeURI(this.getResponseHeader("content-disposition").replace("attachment;filename=", ""));
}var href = "http://" + location.host + '/crowd-web/file/downloadFile?' + $.param(options.data);var $dllink = $('<a href="' + href + '" download="' + fileName + '" ></a>').appendTo(document.body);
$dllink[0].click();
window.URL.revokeObjectURL(href);
} else { //其他现代浏览器采用H5的a标签新特性实现var href = window.URL.createObjectURL(this.response);if (this.getResponseHeader("content-disposition")) {var fileName = decodeURI(this.getResponseHeader("content-disposition").replace("attachment;filename=", ""));
}var $dllink = $('<a href="' + href + '" download="' + fileName + '" ></a>').appendTo(document.body); //initMouseEvent已经被放弃，直接使用a标签的dom节点click功能触发点击//var event = document.createEvent("MouseEvents");//event.initMouseEvent(// "click", true, false, window, 0, 0, 0, 0, 0// , false, false, false, false, 0, null//);//$dllink[0].dispatchEvent(event);$dllink[0].click();
window.URL.revokeObjectURL(href); //告诉浏览器可以释放该路径 }
}
}
};
},
tools.dlFile({
data : {"fileId":item.id},
url :config.URL.downLoad,
contentType : "application/json;chartset=utf-8",
})
檔案下載的最佳方法選用：博文；
使用H5 a標籤的新特性：博文；
Blob物件及createObjectURL 與revokeObjectURL方法 : 博文;
提問：
a標籤模擬click事件： 你猜如下程式碼能觸發頁面調轉嗎？
<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"></head><body><a href="http://www.baidu.com" id="hehe">百度</a><button>跳到百度</button><script src="bower_components/jquery/dist/jquery.js?1.1.11"></script><script>$("button").click(function(){
alert(123)
$("#hehe").click();
})</script></body></html>
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