Mixing in less
The meaning of
mixing : mixing is the way to introduce a series of attributes from one rule set to another. In
general, a rule set refers to a set of codes, a set of codes that define certain rules, such as a set of codes that define styles. It’s a rule set. For
example 
, the style inside is a rule set.
Mixing means applying a set of rules to another element
Mixed categories:
普通混合
不带输出的混合
带参数的混合
带参数并且有默认值的混合
带多个参数的混合
命名参数
匹配模式
arguments变量
Normal mix
That is, directly write a selector that does not affect the elements in the html, and then write the rule set in the code body, and then directly let other rule sets call
This method causes less when compiling the css is not to be compiled into the css selector #diaoyongalso translated into a
Mix without output
Adding after the selector ()will not be compiled into ``css```
Time of the call plus without ()all right
Mixed with parameters
Parameters are variables, so we can also set formal parameters and pass actual parameters to it just like a function, but note that this is a hybrid, not a function
Define the attribute value that the formal parameter is @aset to background-color, which is equal to background-colora rule set with a variable value at this time , and then pass the parameter while calling the changed background-colorvalue
Mixed with parameters and default values
The method 形参变量:值of setting the default value: After setting the default value, when no value is passed to the formal parameter, the value of these variables is automatically set to the default value
Note that only the parameters with default values can be declared in parentheses when invoking, but the parameters without default values will be reported when invoking, if there is no declaration in the parentheses.
Mixing with multiple parameters
In this way, a mixture of multiple parameters
Named parameters
When our mix has multiple parameters, we can copy the specific parameters without default value or need to change the default value.
Specify the variable name when calling, and assign it specially
It is possible to modify only the default values of some specific variables in the formal parameters
Match mode
This mixture is similar to the overloading of functions. We write multiple mixtures of the same name and the same parameter, but our functions are different. We can add a character in front of each parameter with the same name as its identifier. Different from other mixtures of the same name
If we add one to the front of a mixture with the same name, @_it will become an automatic call mixture, that is, when we call other mixtures with the same name, the system will automatically call this mixture at the same time.
Call a method of a mixture of the same name:
when we call one of the mixtures, we can add a specific indicator of the mixture of the same name in front of the actual parameter list to tell the system which mixture of the same name we want to call
即匹配哪个同名混合，(匹配模式)
Here will also automatically call the added @_mix of the same name, the first line is to introduce other less files
Introduce other less files in less
That is, we can write complex and versatile code in a less file, and then call other files to pass the value, similar to encapsulation.
Before calling the mix in other less, we need to put the declaration syntax before the call
:
@import "路径"
In this way, you can directly use the contents of other less files in a less file
arguments variable
Used to simplify the call of formal parameters in the mix. It
is tasteless, which is similar to the hidden array in js
We write i.e. mixed inside @argumentsit @argumentsa value equal to the value of the parameter of all, as shown below, @argumentsthe value 1px solid black
may be written a plurality of @argumentseach of @argumentsthe values are the same, all parameter values are the
less calculation
In less, you can add, subtract, multiply and divide. For example 100 + 100px, in less, the two sides of the operation can only add a unit. When calculating, it is best to add a space between the value and the operation symbol, otherwise it may make mistakes.