Common functions of JS

1. Functions for regular Expressions:

var pattern=/\d{3}-\d{2}-\d{4}/;//here is an object type alert (Pattern.test ("Cscscscs")); alert (typeof pattern);

2. Used to return numbers according to the number of decimal places specified

var num=1.2434343343;var tnum=num.tofixed (1);//parameter displays several decimal alert (typeof Tnum)//converted to a string

3. Used to turn a number into exponential notation:

var num=12434343343;var tnum=num.toexponential (1);//parameter displays several decimal digits of alert (typeof Tnum)//converted to Stringalert (tnum);

4. String concatenation function

/** * This is the concatenation function of the string * @type {string} */var c1= "SCS"; var c2= "Csscs"; var result=c1.concat (C2); alert (result);

Common functions of JS