關于js改變css樣式的寫法
<!doctype?html>
<html>
<head>
????<meta?charset="utf-8">
????<title>浮動去空格</title>
????<style>
????????button?{?margin:?0;?}
????????/*這里clear：both，為的就是當左浮動之后，這個p不會跟著去浮動，如果設置none，那么p元素會跟著浮動*/
????????p?{?clear:?both;?}
????</style>
</head>
<body>
<button>按鈕1</button>
<button>按鈕2</button>
<button>按鈕3</button>
<button>按鈕4</button>
<p><input?type="button"?id="trigger"?value="點擊按鈕浮動"></p>
<script>
????var?trigger?=?document.getElementById("trigger"),
????????buttons?=?document.getElementsByTagName("button");
????var?length?=?buttons.length;
????if?(trigger?&&?length?>?0)?{
????????trigger.onclick?=?function()?{
????????????for?(var?index?=?0;?index?<?length;?index?+=?1)?{
????????????????buttons[index].style["cssFloat"?in?trigger.style??"cssFloat":?"styleFloat"]?=?"left";
????????????}
????????};
????}
</script>
</body>
</html>其中?buttons[index].style["cssFloat" in trigger.style? "cssFloat": "styleFloat"] = "left"; 這個是啥意思？沒見過這種寫法
