Function numericToNumber

_benchmarks/sample_echarts.js:7060–7065

* [Numberic is defined as]: * `parseFloat(val) == val` * For example: * numeric: * typeof number except NaN, '-123', '123', '2e3', '-2e3', '011', 'Infinity', Infinity, * and they rounded by white-spaces or line-terminal like ' -123 \n ' (see es spec) * not-n

(val)

     */

    function numericToNumber(val) {
      var valFloat = parseFloat(val);
      return valFloat == val // eslint-disable-line eqeqeq
      && (valFloat !== 0 || typeof val !== 'string' || val.indexOf('x') <= 0) // For case ' 0x0 '.
      ? valFloat : NaN;
    }
    /**
     * Definition of "numeric": see `numericToNumber`.
     */