if(someVariableExists) 
  x = false 

if(someVariableExists) 
  x = false 
  anotherFunctionCall(); 

if(someVariableExists) { 
  x = false; 
  anotherFunctionCall(); 
}

if(someVariableExists) { 
  x = false; 
} 
anotherFunctionCall();

if(2 + 2 === 4) return 'nicely done'; 

for(var i = 0; i < someArray.length; i++) { 
  var container = document.getElementById('container'); 
  container.innerHtml += 'my number: ' + i; 
  console.log(i); 
} 

var container = document.getElementById('container'); 
for(var i = 0, len = someArray.length; i < len; i++) { 
  container.innerHtml += 'my number: ' + i; 
  console.log(i); 
} 

var arr = ['item 1', 'item 2', 'item 3', ...]; 
var list = '<ul><li>' + arr.join('</li><li>') + '</li></ul>';

var name = 'Jeffrey'; 
var lastName = 'Way'; 
function doSomething() {...} 
console.log(name); // Jeffrey -- 或 window.name
// 更好的做法
var DudeNameSpace = { 
  name : 'Jeffrey', 
  lastName : 'Way', 
  doSomething : function() {...} 
} 
console.log(DudeNameSpace.name); // Jeffrey

// 循环数组，输出每项名字（译者注：这样的注释似乎有点多余吧）
for(var i = 0, len = array.length; i < len; i++) {
  console.log(array[i]); 
} 

setInterval( 
"document.getElementById('container').innerHTML += 'My new number: ' + i", 3000 
);

with (being.person.man.bodyparts) { 
  arms = true; 
  legs = true; 
}

being.person.man.bodyparts.arms = true; 
being.person.man.bodyparts.legs= true; 

var o = being.person.man.bodyparts; 
o.arms = true; 
o.legs = true; 

ar o = new Object(); 
o.name = 'Jeffrey'; 
o.lastName = 'Way'; 
o.someFunction = function() { 
  console.log(this.name); 
}

var o = { 
  name: 'Jeffrey', 
  lastName = 'Way', 
  someFunction : function() { 
   console.log(this.name); 
  } 
};

var a = new Array(); 
a[0] = "Joe"; 
a[1] = 'Plumber';

// 更好的做法：
var a = ['Joe','Plumber'];

var someItem = 'some string'; 
var anotherItem = 'another string'; 
var oneMoreItem = 'one more string';
// 更好的做法
var someItem = 'some string', 
  anotherItem = 'another string', 
  oneMoreItem = 'one more string';

function TimeTracker(){ 
 console.time("MyTimer"); 
 for(x=5000; x > 0; x--){} 
 console.timeEnd("MyTimer"); 
}