jQuery是一个快速、简洁的JavaScript库,它简化了HTML文档遍历、事件处理、动画和Ajax交互等操作,而原生JavaScript是浏览器内置的一种编程语言,用于控制网页的行为和交互,在实际应用中,我们可能需要将jQuery代码转换为纯JavaScript代码,或者将纯JavaScript代码转换为jQuery代码,本文将详细介绍如何进行这两种转换。

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将jQuery代码转换为纯JavaScript代码
1、选择器转换
jQuery使用CSS选择器来选取元素,而原生JavaScript使用document.querySelector或document.getElementById等方法,将以下jQuery代码:
$("#myButton").click(function() {
// do something
});
转换为纯JavaScript代码:
document.querySelector("#myButton").addEventListener("click", function() {
// do something
});
2、事件处理转换
jQuery使用.on方法来绑定事件,而原生JavaScript使用addEventListener方法,将以下jQuery代码:
$("#myDiv").on("click", ".myClass", function() {
// do something
});
转换为纯JavaScript代码:
var myDiv = document.querySelector("#myDiv");
myDiv.addEventListener("click", function(event) {
if (event.target.classList.contains("myClass")) {
// do something
}
});
3、动画转换
jQuery提供了animate方法来实现元素的动画效果,而原生JavaScript可以使用requestAnimationFrame方法结合CSS样式来实现动画效果,将以下jQuery代码:
$("#myDiv").animate({left: "200px"}, 1000);
转换为纯JavaScript代码:
var myDiv = document.querySelector("#myDiv");
var startTime = null;
function animate() {
var currentTime = new Date().getTime();
if (!startTime) {
startTime = currentTime;
}
var progress = (currentTime startTime) / 1000; // calculate progress in seconds
var left = parseInt(myDiv.style.left) + (progress * 200); // calculate new left position based on progress and duration
myDiv.style.left = left + "px"; // set new left position to the element
if (progress < 1) { // continue animation if not finished yet
requestAnimationFrame(animate);
} else { // reset animation if finished
myDiv.style.left = "0px"; // reset left position to initial value
}
}
requestAnimationFrame(animate); // start animation with a single frame request
4、Ajax转换
jQuery提供了$.ajax方法来实现Ajax请求,而原生JavaScript可以使用XMLHttpRequest对象或者更现代的fetch API来实现,将以下jQuery代码:
$.ajax({url: "/api/data", success: function(data) {
// handle data received from server
}});
转换为纯JavaScript代码:
var xhr = new XMLHttpRequest(); // create a new XMLHttpRequest object
xhr.open("GET", "/api/data", true); // open a connection to the specified URL with the specified method and async flag set to true (asynchronous)
xhr.onreadystatechange = function() { // define what to do when the readyState changes (e.g., when the response is received)
if (xhr.readyState === 4 && xhr.status === 200) { // check if the request has completed successfully (readyState === 4) and if the response status code is OK (status === 200)
var data = JSON.parse(xhr.responseText); // parse the response text as JSON and store it in the data variable
// handle data received from server using the data variable here...
} else if (xhr.readyState === 4) { // handle any other readyState values (e.g., network error) here...
// handle error or exception here...
} else { // handle any other readyState values (e.g., loading) here...
// show loading indicator or perform any other actions here...
}
};
xhr.send(); // send the request to the server with the specified method and parameters (e.g., no parameters for a GET request)
将纯JavaScript代码转换为jQuery代码
1、选择器转换(略)
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