javascript 在 Jquery 中访问值的最后三个字符
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access the last three Characters of the value in Jquery
提问by Someone
I have a value "319CDXB" everytime i have to access last three characters of the Strring how can i do this . Usually the Length varies all the time .Everytime I need the last characters of the String using Jquery
每次我必须访问 Strring 的最后三个字符时，我都有一个值“319CDXB”，我该怎么做。通常长度一直在变化。每次我需要使用 Jquery 的字符串的最后一个字符时
回答by user113716
The String .slice()methodlets you use a negative index:
该字符串.slice()的方法，您可以使用负指数：
var str = "319CDXB".slice( -3 ); // DXB
EDIT:To expound a bit, the .slice()method for String is a method that behaves very much like its Array counterpart.
编辑：稍微解释一下，.slice()String 的方法是一种行为非常类似于它的Array 对应物的方法。
The first parameter represents the starting index, while the second is the index representing the stopping point.
第一个参数表示起始索引，而第二个参数是表示停止点的索引。
Either parameter allows a negative index to be employed, as long as the range makes sense. Omitting the second parameter implies the end of the String.
只要范围有意义，任一参数都允许使用负索引。省略第二个参数意味着字符串的结束。
Example:http://jsfiddle.net/patrick_dw/N4Z93/
示例：http : //jsfiddle.net/patrick_dw/N4Z93/
var str = "abcdefg";
str.slice(0); // "abcdefg"
str.slice(2); // "cdefg"
str.slice(2,-2); // "cde"
str.slice(-2); // "fg"
str.slice(-5,-2); // "cde"
The other nice thing about .slice()is that it is widely supported in all major browsers. These two reasons make it (in my opinion) the most appealing option for obtaining a section of a String.
另一个好处.slice()是它在所有主要浏览器中都得到广泛支持。这两个原因使它（在我看来）成为获取字符串部分的最有吸引力的选择。
回答by James Kovacs
You can do this with regular JavaScript:
您可以使用常规 JavaScript 执行此操作：
var str = "319CDXB";
var lastThree = str.substr(str.length - 3);
If you're getting it from jQuery via .val(), just use that as your str in the above code.
如果您通过 .val() 从 jQuery 获取它，只需将其用作上述代码中的 str 即可。
回答by H?vard
Simple:
简单的：
str = "319CDXB"
last_three = str.substr(-3)
回答by David Tang
var str = "319CDXB";
str.substr(str.length - 3); // "DXB"
