I have a problem that I hope to use one variable's contents as another variables name in javascript. In this case, I do not know what is the contents in that variable, I only know it is a text type and I hope the variable I need to declare will use that text as its name.
Anyone could kindly give me some suggestion of how to do that?
Thank you!
You are able to use a variable's value as another variable's name as long as the latter variable can be accessed via bracket notation, e.g.
var firstVariable = 'secondVariable';
window[firstVariable] = 'secondValue';
// you now have a global variable
// named "secondVariable" with the value "secondValue"
Note I would not recommend cluttering the global namespace like this; it was just for demonstration.
You can't really, variable names (identifiers) are static (as long as you don't use eval) in a scope.
However, you can easily use objects for that. Accessing properties of them with a variable name is easy, use the bracket notation:
var obj = { someprop:"someval", otherprop:… },
name = "someprop";
obj[name]; // "someval"
If you need a global variable, you can do that by accessing it as a property of the global object (in browsers: window):
variable = "someval";
var name = "variable";
window[name]; // "someval"
