JavaScript variable names are subject to two simple rules:
1. The first character must be a letter, an underscore (_), or a dollar sign ($).
2, the remaining characters can be underlined, dollar sign or any letter or numeric character.
Name Method:
1, camel notation-the first letter is lowercase, the next words are capitalized letters begin. Such as:
var mytestvalue = 0, Mysecondtestvalue = "HI";
2, Pascal notation--The first letter is capitalized, the next words are capitalized letters start. Such as:
var mytestvalue = 0, Mysecondtestvalue = "HI";
3. Hungarian type notation--Appends a lowercase letter (or lowercase alphabetical sequence) to a variable named after the Pascal notation, indicating the type of the variable. For example, I represents an integer and S represents a string, such as:
var imytestvalue = 0, Smysecondtestvalue = "HI";
The common prefixes are listed below:
| Type |
Prefix |
Example |
| Array |
A |
Avalue |
| Boolean type |
B |
Bfound |
| Floating-point type |
F |
Fvalue |
| Function |
Fn |
Fnmethod |
| Integral type |
I |
Ivalue |
| Object |
O |
Otype |
| Regular expressions |
Re |
Repattern |
| String |
S |
Svalue |
| Variable |
V |
Vvalue |
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