What is the difference between lua and javascript

Difference: 1. The comment code of JavaScript is "//", and the comment code of Lua is "--"; 2. JavaScript uses val to declare global variables and there are no local variables, while Lua does not need to be directly positioned. are global variables, and local declarations are local variables.

The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.

What is the difference between lua and javascript

Comparison of the differences between Lua and Javascript

Lua simulator js solution

1. Syntax level simulation

Differences between lua and js language

1.1 Comments

js is //, lua is --.

1.2 Variables

js uses val to declare global variables and there are no local variables, while lua does not need to be positioned directly. are global variables, and local declarations are local variables.

1.3 Operator

• js

- * / % --

= = -= *= /= %=

Supported strings

txt1 = "what a very";

txt2 = "nice day";

txt3 =txt1 " " txt2;

The output result of printing txt3 is "what a very nice day".

Rule:

Compare numbers with strings Add, the result will become a string.

• lua

binary: - * / ^ %

uniary:- (Minus sign)

lua strings are spliced ​​into ..

For example, "Hello ".."World" is spliced ​​into Hello World

1.4 Relational Operator

• js relational operator

== === (congruent) != > < >= < =

• lua relational operator

1.5 Logical operators

##js
&& || !

lua
and or not

js class c
if else

lua
if then else

if then

elseif then

else

end

There must be end

lua does not support Switch statement

js
Alert box alert("text")

Confirm box prompt("text","default value")

lua
Extended support for warning boxes and confirmation boxes

• function 函数名(参数)
  {
  　　代码．．．
  }

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  js with {} class c

• function 函数名( 参数)
  end

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  lua class vb script

2.0 For loop

js: Class c

for (i=0;i<=10;i++)
{
  document.write("The number is " + i)
  document.write("<br />")
}

for var= exp1,exp2,exp3 do
<执行体>
end

for i =1,100 do 
print(i)
end
for i =1,100,2 do 
print(i)
end

--打印数组a 的所有值
for i,v in pairs(a) do print(v) end

---打印table t中所以的key
for k in pairs(t) do print(k) end

2.1 While loop

js: Class c

while (变量<=结束值)
{
    需执行的代码
}
lua:
i =1;
while a[i] do
print(a[i])
i = i+1;
end

repeat:
 line = io.read()
until line~=""
print(line)

2.2 Break and Continue

• that can be used in loops Statements in: break and continue

<script type="text/javascript">
var i=0
for (i=0;i<=10;i++)
{
if (i==3){break}
document.write("The number is " + i)
document.write("<br />")
}
</script>
Continue

<script type="text/javascript">
var i=0
for (i=0;i<=10;i++)
{
if (i==3){continue}
document.write("The number is " + i)
document.write("<br />")
}
</script>

• supports break, but does not support continue.

local i =1
while a[i] do
 if a[i] == v then break end
 i = i +1
end

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2.3 For... In statement

js: Use the For...In statement to specifically traverse the elements in the array.

for (变量 in 对象)
{
    在此执行代码
}

<script type="text/javascript">
var x
var mycars = new Array()
mycars[0] = "Saab"
mycars[1] = "Volvo"
mycars[2] = "BMW"
for (x in mycars)
{
document.write(mycars[x] + "<br />")
}
</script>

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