属性名称“ var”在javascript关联数组中

 var a = {};
 a.var = \"test\";

 a[\"var\"] = \"test\";
 a.id = \"another test\";

7.6.1.1 Keywords
The following tokens are ECMAScript keywords and may not be used as Identifiers in ECMAScript programs.

break, do, instanceof, typeof, case, else, new, var, catch, finally, return, void, continue, for, switch, while, debugger, function, this, with, default, if, throw, delete, in, try

var

var myObject = {
  new : 30,
  var: 20
}