javascript 字符串中的逻辑运算符

Question

I have a string like this "(ReadAccountAccess || ReadContractAccess) && CreateAccountAccess"

And I have this object:

{
  PermissionID: 1,
  AccountID: 1,
  ReadAccountAccess: true,
  ReadContractAccess: true,
  CreateAccountAccess: true,
}

How can I check this condition?

Answer 1

It is NOT recommended, but you could use with statement and evaluate the expression with that object as the scope.

 function check(obj, condition) { with(obj) { return eval(condition) } } const input={PermissionID:1,AccountID:1,ReadAccountAccess:true,ReadContractAccess:true,CreateAccountAccess:true}; console.log( check(input, "(ReadAccountAccess || ReadContractAccess) && CreateAccountAccess"), check(input, "ReadAccountAccess === false"), check(input, "AccountID === 1") )

Instead of saving the condition in a string, you could use a function which takes an object as an input and returns the condition expression. This is a much better of deferring the check.

 const input={PermissionID:1,AccountID:1,ReadAccountAccess:true,ReadContractAccess:true,CreateAccountAccess:true}; const c1 = o => (o.ReadAccountAccess || o.ReadContractAccess) && o.CreateAccountAccess, c2 = o => o.ReadAccountAccess === false, c3 = o => o.AccountID === 1 console.log( c1(input), c2(input), c3(input) )

Answer 2

You can use eval() javascript function.

 const obj = { PermissionID: 1, AccountID: 1, ReadAccountAccess: true, ReadContractAccess: true, CreateAccountAccess: true, }; const { PermissionID, AccountID, ReadAccountAccess, ReadContractAccess, CreateAccountAccess } = obj; const opr = "(ReadAccountAccess || ReadContractAccess) && CreateAccountAccess"; console.log(eval(opr));