JS scripting language JavaScript

<script src= "" ></script>/* External reference

<script type= "Text/javascript" > Alert ('); /* Used to debug pages, or reminders (SMS sent)

</script>

Single-line Comment

/* Multiline Comment */

A newline can represent the end of a statement, or it can be added without

Integer: int single-Precision decimal:

Float double-precision decimal:

Double decimal:

Decimal currency type:

Money characters:

char (single character)

Strings: String

boolean bool:

True False

Date Time Type: datetime

var x = 1;/* Define Variable

var y = ' 1 '; /* Define String

var z = true; /* Define BOOL Type

Alert (typeof (X)); /* Method Name (parameter)

parseint (y); /* String to Number

var y_int = parseint (y);   var y_str = Y_int + "; /* Numeric to String

&& logic and, | | Logical OR,! Logical Non-

= = = * Mandatory equals (type is the same)

Confirm (")/* differs from alert: there is a cancellation

var temp = confirm ("); Alert (temp);

var temp = prompt (","); Alert (temp);

var x = prompt (' Enter a number ');/* The number entered will be assigned to X

If statement:

if (judging condition) {

When judged to be true, the executed statement

} else{

When the judgment is false, the executed statement

}

Switch statement:

Switch (parameter) {

Case ' parameter corresponds to value 1 ': Execute statement

Break

Case ' 2 ': alert (' two ');

Break

Default:/* Executes the execution statement if all of the above conditions are not met;

Break

}

Ternary operator: var x = judging condition?   A:B; /*true when the a:false is B;

JS scripting language JavaScript