如果页面被空白打开，则隐藏后退菜单按钮
[英]hide back menu button if page was opened as a blank
问题描述
How to hide a back button (in nav menu) if current page was opened with target="_blank". 
如果当前页面是使用target =“ _ blank”打开的，则如何隐藏后退按钮（在导航菜单中）。
in usual case this page is called as: 在通常情况下，此页面称为：
<a href="/about_us/" class="nav-li" >About Us</a>
in another case it is called with: 在另一种情况下，它被称为：
<a href="/about_us/" class="nav-li" target="_blank" >About Us</a>
The code at the target page for the back button is: 后退按钮在目标页面上的代码是：
<label class="nav-li" for="back">Back</label>
<input class='Back' id = "back" type=button value="Back" onClick="history.go(-1)">
How to hide this button if opened as blank ??? 如果打开为空白该如何隐藏此按钮？？？
Whole project is on Django 整个项目在Django上
2 个解决方案
解决方案1
2 已采纳 2017-12-20 10:51:20
Just hide the button if the history object has a length 如果history对象具有length则只需隐藏button of null less than 2 . 的null 小于2。 This could be done with a css-class, pure css or direct with JS 这可以使用CSS类，纯CSS或直接通过JS完成
[EDIT]: [编辑]：
I would add this to the onload event of the new form. 我会将其添加到新表单的onload事件中。
function init(){
if(history.length < 2){
document.getElementById('Back').style.display = none;
}
}
[...]
<body onload="init()">
[...]
解决方案2
0 2017-12-20 11:10:22
You should heck the history object if the length is less or equal to 1 so it haven't a history, so you can hide your btn 如果长度小于或等于1，则应扩展历史记录对象，因此它没有历史记录，因此可以隐藏btn
window.onload = function (){
var hasHistory = history.length <= 1; //if has an history;
document.getElementById('cacca').style.display = hasHistory ? "none" : "block";
}
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