# 語句 [toc] ## 條件語句 - if...else... - switch ## 循環語句 - while - do...while... - for - for...in... - break,continue(break跳出循環，continue跳過本次循環) ## with語句 把作用域指向特定對象 ``` javascript var kitty = { age:3, friend:{ name:'snoopy', age:2 } } with(kitty.friend){ document.write(name + '\'s age is' + age); } ``` ## 異常捕獲語句 ``` javascript try{ document.write(notDefined); }catch(error){ console.log(error); alert(error); }finally{ alert('finally'); } ```