我想使用javascript将段落可见性更改为无或动态隐藏。我有4个段落,我只想显示一个。如果用户单击右键,则应显示下一个段落而不是前一个段落。如果左键,然后是另一种方式。但我的事件处理程序似乎没有在 paragrap_switch 函数内响应。请帮助我
HTML
<head>
<style>
p{
border:1px solid black;
width:20%;
display:none;
}
input{
width:40px;
}
</style>
</head>
<body>
<p class="paragraph">TEXT 1</p>
<p class="paragraph">TEXT 2</p>
<p class="paragraph">TEXT 3</p>
<p class="paragraph">TEXT 4</p>
<input type = "button" value = "left" class = "button"/>
<input type = "button" value = "right" class = "button"/>
和 Javascript
function paragraph_switch (){
var paragraphs = document.getElementsByClassName('paragraph');
var buttons = document.getElementsByClassName('button');
for(var i = 0;i < paragraphs.length; i++){
if(i >= 0){
if(buttons[0].onclick = function(){
paragraphs[i].style.display = "none";
paragraphs[i+1].style.display = "block";
i++;
}
else if(buttons[1].onclick = function(){
paragraphs[i].style.display = "none";
paragraphs[i-1].style.display = "block";
i--;
}
}
}
}