一个不错的字符串转码解码函数(自写)_javascript技巧

function isString(variable) {
  return Object.prototype.toString.call(variable).indexOf('String') != -1;
}

function isNumeric(variable) {
  return !isNaN(parseFloat(variable)) && isFinite(variable);
}

function stringEncode(string) {
  string = isString(string) || isNumeric(string) ? String(string) : '';

  var code,
    i = 0,
    code_string = '',
    len = string.length;

  while(i