js快速打印一个五分制（五颗星）的评分情况

1.函数

下面这个函数实现了在html页面中快速打印一个五分制（五颗星）的评分情况：

 function getRating(rating) {

     if(rating > 5 || rating < 0) throw new Error('数字不在范围内');

         return "★★★★★☆☆☆☆☆".substring(5 - rating, 10 - rating );

 }

2.demo如下

 <!DOCTYPE HTML>

 <html>

 <head>

 <meta charset="utf-8">

 <title>star</title>

 <style>

 body, div {

     padding: 0;

     margin: 0;

 }

 </style>

 </head>

 <body>

     <div  id="x" onclick="getRating(3);">Click me</div>

 <script>

 function getRating(rating) {

     if(rating > 5 || rating < 0) throw new Error('数字不在范围内');

     var div=document.getElementById('x');

     div.innerHTML="★★★★★☆☆☆☆☆".substring(5 - rating, 10 - rating );

 }

 </script>

 </body>

 </html>

4.效果图

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" alt="" width="408" height="266" />

5.说明

substring函数时js的原生函数，其用法如下：

substring() 方法用于提取字符串中介于两个指定下标之间的字符。

语法

stringObject.substring(start,stop)

参数	描述
start	必需。一个非负的整数，规定要提取的子串的第一个字符在 stringObject 中的位置。
stop	可选。一个非负的整数，比要提取的子串的最后一个字符在 stringObject 中的位置多 1。如果省略该参数，那么返回的子串会一直到字符串的结尾。

参数

描述

start

必需。一个非负的整数，规定要提取的子串的第一个字符在 stringObject 中的位置。

stop

可选。一个非负的整数，比要提取的子串的最后一个字符在 stringObject 中的位置多 1。

如果省略该参数，那么返回的子串会一直到字符串的结尾。

返回值

一个新的字符串，该字符串值包含 stringObject 的一个子字符串，其内容是从 start 处到 stop-1 处的所有字符，其长度为 stop 减 start。

说明

substring() 方法返回的子串包括 start 处的字符，但不包括 stop 处的字符。

如果参数 start 与 stop 相等，那么该方法返回的就是一个空串（即长度为 0 的字符串）。如果 start 比 stop 大，那么该方法在提取子串之前会先交换这两个参数。