js_match.js

  var str = '血红蛋白(123,g/L) 血红蛋白(1209803,g/L) 血红蛋白(19821,g/L)'; 
  var regexp = /\((\d+)/g;
  while (true) {
    var r = regexp.exec(str);
    if (r != null) {
      console.log(r[1]);
    }
    else {
      break;
    }
  }