javascript 使可见对象隐藏和隐藏对象可见
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Making visible object hidden and hidden object visible
提问by Cute Bear
I have a javascript function that is supposed to make visible objects hidden and hidden objects visible. since I lack of basic javascript knowlegde, I came here to ask help from you :/ Can someone help me out with my code so that I can learn a little?
我有一个 javascript 函数，它应该使可见对象隐藏和隐藏对象可见。由于我缺乏基本的 javascript 知识，所以我来这里是为了向您寻求帮助：/ 有人可以帮我解决我的代码，以便我可以学到一些东西吗？
function DisplayMenu(obj) {
if (obj.style.visibility == 'visible') {
obj = document.getElementById(obj);
obj.style.visibility = 'hidden';
}
else if (obj.style.visibility == 'hidden') {
obj = document.getElementById(obj);
obj.style.visibility = 'visible';
}
}
回答by HymanJoe
You need to define what objis before the if:
您需要定义obj在 之前的内容if：
function DisplayMenu(obj) {
var obj = document.getElementById(obj);
if (obj.style.visibility == 'visible') {
obj.style.visibility = 'hidden';
}
else {
obj.style.visibility = 'visible';
}
}
EDIT: You could simplify it, you don't need the else ifjust use else
编辑：你可以简化它，你不需要else if只是使用else
回答by Ale? Kotnik
And even shorter version which checks for existance of obj_idbefore assignment, so in the case there is no obj_idin DOMit doesn't trigger exception:
甚至更短的版本，检查的所有脑干obj_id分配之前，所以在情况下，没有obj_id在DOM它不会触发异常：
function DisplayMenu(obj_id) {
var obj = document.getElementById(obj_id);
obj && obj.style.visibility = (obj.style.visibility == 'visible') ? 'hidden' : 'visible';
}
