据我了解，AJAX 使 javascript 异步。我是 AJAX 新手，但注意到在 html 文档创建脚本时有一个脚本异步属性。这些与 AJAX 做同样的事情还是我一厢情愿。我发现在 DOM 生成中使用的现有 javascript 文件中使用 php 非常有用。为什么？让生活变得更轻松并且尽可能面向对象。我唯一想要的就是使用 php 输出由 javascript 生成的 php 文件，但后来我想直接使用 javascript 方法生成 php。
index.php
<!DOCTYPE html>
<script type="text/javascript" src="jWebKit.js"></script>
<script>
var div = new Div();
div.setPosition(Div.FIXED);
div.setBounds(100,0,100,100);
div.horizontalAlign(Div.LEFT);
div.setPosition(Div.RELATIVE);
</script>
jWebKit.js
var head;
var body;
var jScript;
var devScript;
var phpScript;
(function(){
document.open();
jScript = document.createElement("script");
jScript.src = "jWebKit.js";
jScript.type = "text/javascript";
devScript = document.createElement("script");
phpScript = document.createElement("script");
php.type = "text/javascript";
php.text = 'document.write("<?php fopen("testfile.php", "w") ;?>");'; // This is the target script needed for file output below...
phpScript.async = 'true';
}());
window.onload = function(){
var cutScript;
head = document.head;
body = document.body;
cutScript = head.innerHTML.toString().replace(jScript.outerHTML.toString(),'');
devScript.text = phpScript.innerHTML.toString() + cutScript.replace('<script>', '').replace('</script>','');//Does not work!
body.appendChild(devScript);
head.innerHTML = head.innerHTML.toString().replace(cutScript,'');
alert(document.documentElement.outerHTML);
document.close();
};
function Div(){
Div.STATIC = 'static';
Div.ABSOLUTE = 'absolute';
Div.RELATIVE = 'relative';
Div.FIXED = 'fixed';
Div.SOLID = 'solid';
Div.DOTTED = 'dotted';
Div.LEFT = 0;
Div.CENTER = 1;
Div.RIGHT = 2;
Div.TOP = 0;
Div.MIDDLE = 1;
Div.BOTTOM = 2;
var ELEMENT;
var CSS;
var horizontalAlign;
var verticalAlign;
var colorQueue;
(function() {
this.div = document.createElement('div');
ELEMENT = this.div;
CSS = this.div.style;
CSS.border = '1px solid black';
document.body.appendChild(this.div);
}());
this.setPosition = function(postype){
if(!horizontalAlign && !verticalAlign){
CSS.position = postype;
}
}
this.setBounds = function(x,y,width,height){
CSS.left = x + 'px';
CSS.top = y + 'px';
CSS.width = width + 'px';
CSS.height = height + 'px';
}
this.setColorQueue = function(r,g,b){
colorQueue = 'rgb(' + new Array(r,g,b) + ')';
alert(colorQueue);
}
this.horizontalAlign = function(horiz){
var freeSpaceX = ((window.innerWidth - ELEMENT.offsetWidth) / 2);
var defPadding = '8px';
var defPaddingCenter;
var defPaddingRight;
var defPaddingLeft;
horizontalAlign = true;
this.setBounds(0,0,100,100);
if(CSS.position == 'relative' || CSS.position == 'absolute'){
CSS.position = 'absolute';
defPaddingCenter = 12;
defPaddingRight = 4;
defPaddingLeft = 8;
}else if(CSS.position == 'fixed'){
defPaddingCenter = 4;
defPaddingRight = 4;
defPaddingLeft = 8;
}
if(horiz == 0){
if(!verticalAlign){
CSS.marginTop = defPadding;
}CSS.marginLeft = defPaddingLeft + 'px';
}else if(horiz == 1){
if(!verticalAlign){
CSS.marginTop = defPadding;
}CSS.marginLeft = freeSpaceX - defPaddingCenter + 'px';
}else if(horiz == 2){
if(!verticalAlign){
CSS.marginTop = defPadding;
}CSS.marginLeft = (freeSpaceX - defPaddingRight) * 2 + 'px';
}
}
}
最佳答案
我不知道你到底想做什么，但是你正在创建一个永远不会访问服务器的php脚本，因此如果你想调用url testfile.php，它永远不会执行(只有服务器理解php脚本)你应该做这样的事情
xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET","testfile.php?q=something",true);
xmlhttp.send();
xmlhttp.onreadystatechange=function(){
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
//the responseText have the server response
document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
请访问此网站了解更多信息
http://www.w3schools.com/ajax/ajax_xmlhttprequest_create.asp
也可以通过链接查看下一章
顺便说一句，jquery 会为你提供很多帮助
关于javascript - PHP 通过 AJAX 和 Async 在 Javascript 中，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24480934/