+ and PP in javascript

recently I am very interested in this code 

var y = 1;
var i =1;
var t = y+yPP+y+yPP;
i +=iPP+iPP+i;

is a little confused about the above code. The pre-PP and unary addition in the operator priority are at the same level, but the post-PP priority is higher, and the addition + and assignment + = priority is the lowest. As a result, the above t runs one by one from left to back. I wonder if there is a + in which the code runs from left to right, and then when it encounters PP, it counts first, and then calculates +. The precedence of the js operator precedence PP is in the order from right to left, and the post PP is a PP. I don"t know what it means, and I forgot to point it out. I don"t know if I understand it right. I look forward to God"s advice or two. Thank you very much, a rookie who wants to learn from js.

Javascript
Mar.22,2021

this kind of question actually does not have much meaning, usually write should pay attention to do not use.
add parentheses to avoid ambiguity when you are really uncertain. 

var y = 1;
var i =1;
var t = y+(yPP)+y+(yPP);    // 1+1+2+2
i += (iPP)+(iPP)+i;    // 1+1+2+3

you have to understand that y + + y is not valid, so in the order from left to right, if there is no accident, it is generally interpreted as yPP + y

.

Previous: Could you tell me how to output the img tag in the object into a picture?

Next: The problem that Https sites do not request htpp resources

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e5b352-27b4a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e5b352-27b4a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?