How to intercept the last few digits of a string in es6

4 methods: 1. Use "str.charAt(str.length-1)" to intercept the last 1 digit of the string; 2. Use "str.substr(str.length-N)", The last N digits can be intercepted; 3. Use "str.slice(str.length-N)" to intercept the last N digits, etc.

The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.

es6 method of intercepting the last digits of a string

Method 1: Use charAt() to intercept the last digit

The charAt method is to return a character at the specified position

var str="123456";
console.log(str);
var c=str.charAt(str.length-1);
console.log("后一位："+c);

##Method 2: Use substr() to intercept the last N digits

The substr method can extract characters of a specified length from the beginning of the character. Syntax:

str.substr(str.length - N)

If you want to intercept the last few characters of the string, set the parameter N to a few characters.

var str="123456";
console.log(str);
console.log("后1位："+str.substr(str.length-1));
console.log("后2位："+str.substr(str.length-2));
console.log("后3位："+str.substr(str.length-3));
console.log("后4位："+str.substr(str.length-4));

Method 3: Use slice() to intercept the last N bits

The two parameters of slice represent the starting position and The end position includes the starting position and does not include the end position. If omitted, it means the end position.

Syntax:

str.slice(str.length - N)

If you want to intercept the last few digits of the string, set the parameter N to the number.

var str="123456";
console.log(str);
console.log("后1位："+str.slice(str.length-1));
console.log("后2位："+str.slice(str.length-2));
console.log("后3位："+str.slice(str.length-3));
console.log("后4位："+str.slice(str.length-4));
console.log("后5位："+str.slice(str.length-5));

Method 4: Use substring to intercept the last N digits

str.substring(start, end)The method also intercepts a string. The two parameters represent the starting and ending digits respectively, similar to slice, but the difference is that substring does not accept negative numbers, and if the start value is greater than the end value, the two positions will be automatically swapped

Syntax:

str.substring(str.length-N))

If you want to intercept the last few digits of the string, set the parameter N to what number.

var str="123456";
console.log(str);
console.log("后1位："+str.substring(str.length-1));
console.log("后2位："+str.substring(str.length-2));
console.log("后3位："+str.substring(str.length-3));

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