JDK11.0.3 module java.base does not “opens jdk.internal.reflect” to unnamed module @4f757cf6

问题： JDK11.0.3 报错，11.0.2 还正常 Caused by: java.lang.reflec… Read More

代码长期演进

良好的基础（前瞻性设计）良好的可扩展性（优雅的扩展方式）合理的扩展方案（）比… Read More

[转]让SpringBoot启动更快一点

http://www.importnew.com/30647.html 本文由 ImportNe… Read More

[转] SpringBoot实战之SpringBoot自动配置原理

https://www.cnblogs.com/leihuazhe/p/7743479.html … Read More

[转] 微信小程序开发用 JS ES8 async/await 解决异步调用

微信小程序开发用 JS ES8 async/await 解决异步调用在小程序开发… Read More

ES2015 Promise demo

解决:

<!DOCTYPE html>
<html>
  <head>
    <script>
      let i = true;
      function get() {
        const p = new Promise((resolve, reject) => {
          if (i) {
            resolve("ok");
          } else {
            reject("error");
          }
          i = !i;
        });
        return p;
      }
      function onRefresh() {
        const p = get();
        let resultDiv = document.getElementById("result");
        let errorDiv = document.getElementById("error");
        p.then(v => {
          resultDiv.innerText = v;
          errorDiv.innerText = null;
        }).catch(err => {
          resultDiv.innerText = null;
          errorDiv.innerText = err;
        });
      }
    </script>
  </head>
  <body>
    <div id="result"></div>
    <div id="error"></div>
    <button onclick="onRefresh()">刷新</button>
  </body>
</html>

<!DOCTYPE html>

<html>

<head>

let i = true;

function get() {

const p = new Promise((resolve, reject) => {

if (i) {

resolve("ok");

} else {

reject("error");

}

i = !i;

});

return p;

}

function onRefresh() {

const p = get();

let resultDiv = document.getElementById("result");

let errorDiv = document.getElementById("error");

p.then(v => {

resultDiv.innerText = v;

errorDiv.innerText = null;

}).catch(err => {

resultDiv.innerText = null;

errorDiv.innerText = err;

});

}

</script>

</head>

<body>

</body>

</html>

&nbs… Read More

ES2015 生成器 demo

解决: 需要运行在 chrome 及其他支持ES2015的浏览器 [crayon-67eba1da991617… Read More

微信小程序 canvas 初始化的问题

问题: 解决: 需要先在 html 中写 <canvas canvas-id… Read More

html5 canvas demo

解决:

<!doctype <!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>tt</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script>
        function draw(){
            var c = document.getElementById('c');
            var ctx = c.getContext('2d');
            ctx.fillStyle="rgb(200,0,0)"
            ctx.fillRect(100,100,150,150);
            ctx.fillStyle="rgba(0,0,200,0.5)";
            ctx.fillRect(150,150,200,200);
        }
        function getCtx(){
            var c = document.getElementById('c');
            var ctx = c.getContext('2d');
            return ctx;
        }
        function drawPath(){
            var ctx = getCtx();
            ctx.beginPath();
            ctx.moveTo(50,50);
            ctx.lineTo(50,100);
            ctx.lineTo(100,100);
            ctx.stroke();
        }
        function drawFace(){
            var c = getCtx();
            c.beginPath();
            c.arc(75,75,50,0,Math.PI*2,true);
            c.moveTo(110,75);
            c.arc(75,75,35,0,Math.PI);
            c.stroke();
        }
        function drawSVGPath(){
            var c= getCtx();
            c.strokeStyle="#ff0000";
            var p = new Path2D("M10 10 h 80 v 80 h -80 Z");            
            c.stroke(p);
        }
        function drawText(){
            var c = getCtx();
            c.font = "50px serif";
            c.fillStyle = "#00FF00";
            c.strokeText("你好",100,100);
        }
    </script>
</head>

<body onload="drawText()">
    <canvas id="c" width="500" height="500" />
</body>

</html>

<!doctype <!DOCTYPE html>

<html>

<head>

function draw(){

var c = document.getElementById('c');

var ctx = c.getContext('2d');

ctx.fillStyle="rgb(200,0,0)"

ctx.fillRect(100,100,150,150);

ctx.fillStyle="rgba(0,0,200,0.5)";

ctx.fillRect(150,150,200,200);

}

function getCtx(){

var c = document.getElementById('c');

var ctx = c.getContext('2d');

return ctx;

}

function drawPath(){

var ctx = getCtx();

ctx.beginPath();

ctx.moveTo(50,50);

ctx.lineTo(50,100);

ctx.lineTo(100,100);

ctx.stroke();

}

function drawFace(){

var c = getCtx();

c.beginPath();

c.arc(75,75,50,0,Math.PI*2,true);

c.moveTo(110,75);

c.arc(75,75,35,0,Math.PI);

c.stroke();

}

function drawSVGPath(){

var c= getCtx();

c.strokeStyle="#ff0000";

var p = new Path2D("M10 10 h 80 v 80 h -80 Z");

c.stroke(p);

}

function drawText(){

var c = getCtx();

c.font = "50px serif";

c.fillStyle = "#00FF00";

c.strokeText("你好",100,100);

}