CSS3 动画卡顿性能优化解决方案
https://segmentfault.com/a/1190000013045035
https://segmentfault.com/a/1190000013045035
AndroidManifest.xml
文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="cc.nowtime.seven">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme"
tools:ignore="谷歌AppIndexingWarning">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<!--拨打电话权限-->
<uses-permission android:name="android.permission.CALL_PHONE" />
<!--拨打电话权限-->
<uses-permission android:name="android.permission.SEND_SMS"/>
</manifest>
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: cc.nowtime.seven, PID: 12685
java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.CALL dat=tel:xxxxx cmp=com.android.server.telecom/.components.UserCallActivity } from ProcessRecord{e2ed078 12685:cc.nowtime.seven/u0a135} (pid=12685, uid=10135) with revoked permission android.permission.CALL_PHONE
at android.os.Parcel.createException(Parcel.java:2071)
at android.os.Parcel.readException(Parcel.java:2039)
at android.os.Parcel.readException(Parcel.java:1987)
at android.app.IActivityTaskManager$Stub$Proxy.startActivity(IActivityTaskManager.java:3851)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1705)
at android.app.Activity.startActivityForResult(Activity.java:5192)
at android.app.Activity.startActivityForResult(Activity.java:5150)
at android.app.Activity.startActivity(Activity.java:5521)
at android.app.Activity.startActivity(Activity.java:5489)
at cc.nowtime.seven.MainActivity$1.onClick(MainActivity.java:36)
at android.view.View.performClick(View.java:7125)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access$3500(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: android.os.RemoteException: Remote stack trace:
at com.android.server.wm.ActivityStackSupervisor.checkStartAnyActivityPermission(ActivityStackSupervisor.java:1043)
at com.android.server.wm.ActivityStarter.startActivity(ActivityStarter.java:760)
at com.android.server.wm.ActivityStarter.startActivity(ActivityStarter.java:583)
at com.android.server.wm.ActivityStarter.startActivityMayWait(ActivityStarter.java:1288)
at com.android.server.wm.ActivityStarter.execute(ActivityStarter.java:514)
Process 12685 terminated.
java.lang.SecurityException: Permission Denial: starting Intent { act=android.intent.action.CALL dat=tel:xxxxx cmp=com.android.server.telecom/.components.UserCallActivity } from ProcessRecord{e2ed078 12685:cc.nowtime.seven/u0a135} (pid=12685, uid=10135) with revoked permission android.permission.CALL_PHONE
你的 APP 添加拨打电话权限,但是未申请拨打电话权限,所以报错,解决办法:
自己百度 ?????
public class InvokeRun extends Thread {
private int i;
@Override
public void run() {
for(; i<100; i++){
System.out.println("["+Thread.currentThread().getName()+"]\t"+i);
}
}
public static void main(String[] args) throws Exception{
for(int i=0; i<100; i++){
System.out.println(Thread.currentThread().getName()+"\t"+i);
if(i == 20){
new InvokeRun().start();
new InvokeRun().start();
//让当前主线程休眠 1ms
//它会去实行另一个就绪状态的线程
//这样的话,子线程就可以马上开始实行
Thread.sleep(1);
}
}
}
}
forEach
遍历,则会报错,因为它返回的不是一个数组,而是 NodeList
document.querySelectorAll('input[type='selece']]').forEach(function() {
});
大家可以通过一下方法来遍历
const selects = document.querySelectorAll("input[name='select']");
[].forEach.call(selects, function(select) {
console.log(select);
});
标号 提供了一种简单的 break 语句所不能实现的控制循环的方法,当在循环语句中遇到break时,不管其它控制变量,都会终止。
但是,当你嵌套在几层循环中想退出循环时又会怎样呢?
正常的break
只退出一重循环,你可以用标号标出你想退出哪一个语句。
char a;
outer: //this is the label for the outer loop
for(int i=0;i<10;i++)
{
for(int j=0;j<10;j++)
{
a=(char)System.in.read();
if(a=='b')
break outer;
if(a=='c')
continue outer;
}
}
在这个例子中,循环从键盘接受 100 个输入字符,输入“b”字符时,break outer
语句会结束两重循环。
注意:continue outer
语句,它告诉计算机退出美高梅4858mgm的循环并继续实行outer 循环
。
例子2:
求 100-200 之间的质数
System.out.println("100~200 的质数");
int n = 0;
outer:
for (int i=101; i<200; i+=2){
for (int j = 2; j<i; j++){
if(i%j == 0) continue outer;//结束本次外层循环
}
System.out.print(" "+i);;//显示质数
n++;//计算质数个数
if(n<10) continue;//未满10个,则不换行
System.out.println();
n = 0;//重置质数个数
}
转载自:http://blog.sina.com.cn/s/blog_6f8bd746010136yr.html