html
<body> <div id="div"> <ul> <li>☆</li> <li>☆</li> <li>☆</li> <li>☆</li> <li>☆</li> </ul> </div> <p id="p"></p> <p id="score"></p> </body>
id="p"show real-time score
id="score" displays the final score--------------------------------------------- -------
javascript“
$(function () {
//为所有的li标签绑定mouseout和mouseover事件。bind({事件名：function(){},事件名：function(){}})的方法绑定多个事件
$("#div li").bind({
mouseout:function () {
$(this).css("color", "black").html("☆").prevAll().css("color", "black").html("☆")
},
mouseover: function () {
$(this).css("color", "red").html("★").prevAll().css("color", "red").html("★")
}
});
//=实时显示分数.【index】搜索匹配的元素，并返回相应元素的索引值，从0开始计数。
$("#div li").mouseover(function () {
$("#p").html(parseInt( $(this).index("#div li"))+1);
});
//鼠标按下时，确定分数。额，就不更改了，大局已定。
$("#div li").mousedown(function () {
$("#score").html(("你选择的分数是" + (parseInt($(this).index("#div li")) + 1)));
$(this).css("color", "red").html("★").prevAll().css("color", "red").html("★")
//全部li标签的绑定事件全部清除--unbind方法可以加参数清除特定的事件。不加全部清除
$(this).unbind().prevAll().unbind().nextAll().unbind();
});
})
The effect will be as follows:
Unfortunately, once you click on it - it cannot be changed. It's really sad. It was probably just a small show.
PrevAll() and nextAll() these two methods? Let’s talk about the method for now. It can be found in the jquery documentation.
index in jquery returns the index value of the element, starting from zero. Add 1 to the score,
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
