Javascript tasks (100 yuan of WeChat reward), don't understand please add WeChat 13825600069-CodePudding

BXXX on behalf of td id, feels like EXCEL add and subtract formula, asked to write a function, the string representation of the td's Numbers add up.
There are five kinds of forms
string formula

 
Str1="=b199" 
Str2="=b142 - b143" 
Str3="=c18 + c78 + c84 + c125" 
Str4="=b261 + b262 + b263 + b264 + b265 + b266 + b267 + b268 + b269 + b270 + b271 + b272 + b273 - b274" 
Str5="=b2 +... + b17 "

 & lt; Table> 
 
 The serial number & lt;/td>  Value & lt;/td>  The formula & lt;/td> 
 
 
 1 & lt;/td>   
 
 
 2 & lt;/td>   
 
.

CodePudding user response:

Is not quite easy, can write out will point js, id 1 ~ 100, in order to loop for dom, remove the td value converted to the number of add and subtract

CodePudding user response:

A function need to deal with these 5 kinds of circumstances, at the same time the regular expression is not well. Don't come out,

Str1="=b199"
Str2="=b142 - b143"
Str3="=c18 + c78 + c84 + c125"
Str4="=b261 + b262 + b263 + b264 + b265 + b266 + b267 + b268 + b269 + b270 + b271 + b272 + b273 - b274"
Str5="=b2 +... + b17"

CodePudding user response:

Split () the near the b out what thing

CodePudding user response:

 
//now supports addition, subtraction, multiplication, division 
Var str6='=b1 + c2 b2/c1 *' 
Alert (strSplit (str6)) 
//the console. The log () 
The function strSplit (STR) {
If (STR [0]! {
='=')Return the STR 
} 
Var name_id='
Var sum='
Var types=[' + ', '-' and '*', '/']//modify the algorithm of support here 
For (var I=1; i If (types. IndexOf (STR) [I]!=1) {
The sum +=getNum (name_id) + STR [I] 
Name_id='
} else {
Name_id +=STR [I] 
} 
If (I==STR. Length - 1) {
The sum +=getNum (name_id) 
} 
} 
Return the eval (sum) 
} 

The function getNum (id) {
Return the document. The getElementById (id). The innerText 
}

CodePudding user response:

1: the first letter and number=replace null
2: the eval () is the result directly

CodePudding user response:

Simple processing:

 
 
 
 
<meta charset="utf-8"/& gt; 
 Formula test 
 
<body> 
 
 
 
 
 
 
 
 
 
<script> 
Var f='=b261 + b262 + b263 + b264 + b265 + b266 + b267 + b268 + b269 + b270 + b271 + b272 + b273 b274 + 3600'. 
The function CAL (formula) {
//if input is equal to the number of first remove 
If (formula. The substring (0, 1)==='=') {
Formula=formula. The substring (1); 
} 
Each calculation unit//
Var cells=formula. The split (//* + -//g); 
//split operator 
Var operators=formula. The match (//* + -//g); 
//the first unit 
Formula=val (cells [0]); 
//other units splicing operator 
For (var I=1; i Formula +=operators [I - 1) + val (cells [I]); 
} 
//output string after 
The console. The log (formula); 
//output calculation results 
The console. The log (eval (formula)); 
} 
The function val (cell) {
//count as elements of the begin with a letter of id, if there are other can modify the judgment logic 
//function, for example, will get braces... 
If (/[A Za - z]/. The test (cell)) {
Var=dom document. GetElementById (cell); 
The return of the dom. The innerText; 
} else {
Return the cell; 
} 
} 
CAL (f); 
</script>

CodePudding user response:

Pretty simple, don't delete me, not water, is simple, fee brain cells

CodePudding user response:

 
//with regular 
Var str6='=b1 + c2 b2/c1 *' 
The console. The log (onSum (str6)) 
The function onSum (STR) {
If (STR [0]! {
='=')Return the STR 
} else {
Var r=//* + -//g 
STR=STR. The substring (1) 
Var types=STR. Match (r) 
Types? Types. Push (') : types=['] 
Var data=https://bbs.csdn.net/topics/str.split (r). The map (id=> document. The getElementById (id). The innerText). The map ((v, I)=> v + types [I]) 
Return the eval (data. Join (")) 
} 
}

CodePudding user response:

 
 
 
 
 
 
 
 
 
 
 

          
          
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