javaScript杂货铺

函数分析

function Block(func, tag) {
  var _r_function = /^function\b\s*([\$\S]*)\s*\(/;
  var _r_codebody = /[^{]*\{([\d\D]*)\}$/;
  var _r_params = /[^\(]*\(([^\)]*)\)[\d\D]*/;
  tag = (tag || 'body').toLowerCase();
  with (func.toString()) {
    return (tag == 'body') ? replace(_r_codebody, '$1').replace(/^\s*|\s*$/g, '')
      : (tag == 'param') ? ((tag=replace(_r_params, '$1')) ? tag.split(/[,\s]+/) : [])
      : (tag == 'name') ? match(_r_function)[1]
      : (tag == 'scope') ? '[function (' +arguments.callee(func, 'param')+ ') {\n' +arguments.callee(func, 'body')+ '\n}][0]'
      : (tag == 'anonymous') ? Function.apply(this, arguments.callee(func, 'param').concat(arguments.callee(func, 'body')))
      : 'Block() with bad arguments.';
  }
};

function tester() {
    alert('this is a tester');
}
alert(Block(tester, 'body'))