javascript語法

Question

var ret = [] 
      ,xresult = document.evaluate(exp, rootEl, null, 
         XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null) 
      ,result = xresult.iterateNext(); 
    while (result) { 
    ret[ret.length]= result; 
    result = xresult.iterateNext(); 
    } 

任何人都可以解釋我什麼是ret = []，..，...語法？初始化數組？

Answer 1

你說得對。此代碼：

var ret = [] 
      ,xresult = document.evaluate(exp, rootEl, null, 
         XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null) 
      ,result = xresult.iterateNext(); 

可以重寫爲：

var ret = []; 
var xresult = document.evaluate(exp, rootEl, null, 
         XPathResult.UNORDERED_NODE_ITERATOR_TYPE, null); 
var result = xresult.iterateNext(); 

var foo = [];初始化FOO作爲空數組。