JS中string方法中常用方法之一：String.prototype.charAt()
String.prototype.charAt()返回字符串中指定位置的字符。
语法：str.charAt(index)（index 是0 到 字符串长度-1 的一个整数）
例子：输出字符串中不同位置的字符
//下例输出字符串 “Brave new world” 不同位置处的字符
var anyString = “Brave new world”;
console.log(“The character at index 0 is ‘“ + anyString.charAt(0) + “‘“);
console.log(“The character at index 1 is ‘“ + anyString.charAt(1) + “‘“);
console.log(“The character at index 2 is ‘“ + anyString.charAt(2) + “‘“);
console.log(“The character at index 3 is ‘“ + anyString.charAt(3) + “‘“);
console.log(“The character at index 4 is ‘“ + anyString.charAt(4) + “‘“);
console.log(“The character at index 999 is ‘“ + anyString.charAt(999) + “‘“);
//上面代码的输出为：
The character at index 0 is ‘B’
The character at index 1 is ‘r’
The character at index 2 is ‘a’
The character at index 3 is ‘v’
The character at index 4 is ‘e’
The character at index 999 is ‘’
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