js用xpath定位获取元素
一、获取单个元素1、html<html><head><meta charset="utf-8"><script src="test.js"></script></head><body><select style="width: 100%;"><option value="0">-</o
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一、获取单个元素
1、html
<html>
<head>
<meta charset="utf-8">
<script src="test.js"></script>
</head>
<body>
<select style="width: 100%;">
<option value="0"></option>
<option value="1">张三</option>
<option value="2">李四</option>
<option value="3">王五</option>
<option value="4">刘六</option>
</select>
<button type="button" id="a" style="width: 100px; height: 50px;background-color: #eee;">点击</button>
</body>
</html>
2、js
//DOM加载时加载testXpath
addLoadEvent(testXpath)
//测试Xpath
function testXpath(){
document.evaluate("/html/body/button",document).iterateNext().onclick = function(){
var element = document.evaluate("/html/body/select",document).iterateNext();//获取到select元素
var index = element.selectedIndex;//获取元素下标
console.log(element.options[index].text)
}
}
//文档加载函数
function addLoadEvent(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function() {
oldonload();
func();
}
}
}
3、js的优化
将xpath封装,使用更加方便
//DOM加载时加载testXpath
addLoadEvent(testXpath)
//测试Xpath
function testXpath(){
getElementByXpath("/html/body/button").onclick = function(){
var element = getElementByXpath("/html/body/select");//获取到select元素
var index = element.selectedIndex;//获取元素下标
console.log(element.options[index].text);
}
}
//文档加载函数
function addLoadEvent(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function() {
oldonload();
func();
}
}
}
//封装xpath
function getElementByXpath(xpath){
var element = document.evaluate(xpath,document).iterateNext();
return element;
}
二、如何获取xpath
- 1、打开元素所在的网页
- 2、打开开发者模式(F12)
- 3、点击这个小箭头选中你要定位的元素
- 4、在这里右键——》copy——》copy xpath
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