智享笔记 <body>
<script type="text/javascript">
/*
Promise常用API-对象方法
*/
// console.dir(Promise)
function queryData(url) {
return new Promise(function(resolve, reject){
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(){
if(xhr.readyState != 4) return;
if(xhr.readyState == 4 && xhr.status == 200) {
// 处理正常的情况
resolve(xhr.responseText);
}else{
// 处理异常情况
reject('服务器错误');
}
};
xhr.open('get', url);
xhr.send(null);
});
}
var p1 = queryData('http://localhost:3000/a1');
var p2 = queryData('http://localhost:3000/a2');
var p3 = queryData('http://localhost:3000/a3');
// Promise.all([p1,p2,p3]).then(function(result){
// console.log(result)
// })
Promise.race([p1,p2,p3]).then(function(result){
console.log(result)
})
</script>
</body>Promise常用API对象方法
相关推荐
-
生成图片
from PIL import Image, ImageColor, ImageDraw, ImageFont, ImageFilterdef create_image_with_text(size, color, text, font_path, font_size, text_color, shadow_color, output_path): """ Create a new image of specified size and color with centered text that has a border and shadow. :param size: A tuple con
-
获取指定目录下的所有图片信息
1 获取指定目录下的所有图片信息// 获取指定目录下的所有图片信息 public function getImagesInfo($directory) { $images = []; // 创建递归目录迭代器 $iterator = new \RecursiveIteratorIterator( new \RecursiveDirectoryIterator($directory, \RecursiveDirectoryIterator::SKIP_DOTS), \RecursiveIteratorIterator::LEAVES_ONLY ); // 遍历目录中的每个文件 foreach (
-
Thinkphp各版本的PHP要求
ThinkPHP 8.0：运行环境要求PHP8.0+，兼容PHP8.3ThinkPHP 6.1：运行环境要求PHP7.2+，兼容PHP8.1ThinkPHP 6.0：运行环境要求PHP7.2+，兼容PHP8.1ThinkPHP 5.1：运行环境要求PHP5.6+，兼容PHP8.0ThinkPHP 5.0：运行环境要求PHP5.4+，兼容PHP7.3
