概述
hasAttribute
返回一个布尔值,指示该元素是否包含有指定的属性(attribute)。
语法
var result = element.hasAttribute(attName);
result
为返回的布尔值:true
或false
。attName
是一个字符串,表示属性的名称。
例子
// 在为属性设置新值前检测该属性是否存在 var d = document.getElementById("div1"); if (d.hasAttribute("align")) { d.setAttribute("align", "center"); }
备注
DOM methods dealing with element's attributes:
Not namespace-aware, most commonly used methods | Namespace-aware variants (DOM Level 2) | DOM Level 1 methods for dealing with Attr nodes directly (seldom used) |
DOM Level 2 namespace-aware methods for dealing with Attr nodes directly (seldom used) |
---|---|---|---|
setAttribute (DOM 1) |
setAttributeNS |
setAttributeNode |
setAttributeNodeNS |
getAttribute (DOM 1) |
getAttributeNS |
getAttributeNode |
getAttributeNodeNS |
hasAttribute (DOM 2) |
hasAttributeNS |
- | - |
removeAttribute (DOM 1) |
removeAttributeNS |
removeAttributeNode |
- |