</ti
一、强制
<em>
等待
</em>
不论页面是否加载完成，都要
<em>
等待
</em>
指定时间才能执行下一步， 单位
<em>
秒
</em>
，time.sleep(5)import time
time.sleep(10) # 强制
<em>
等待
</em>
10
<em>
秒
</em>
时间 二、隐式
<em>
等待
</em>
（全局
<em>
等待
</em>
）页面加载完成则执行下一步，没有加载完成，则继续
<em>
等待
</em>
到指定时间后再执行下一步。implicitly_wait(10)
# 最多
<em>
等待
</em>
10
<em>
秒
</em>
三、显式
<em>
等待
</em>
每隔指定的时间
selenium自动化测试中时间
<em>
等待
</em>
的方式主要有三种：一是固定
<em>
等待
</em>
时间，脚本运行到此处时，固定停留某一时间，即线程休眠。二是隐式
<em>
等待
</em>
时间，也叫全局
<em>
等待
</em>
时间。三是显式
<em>
等待
</em>
时间。1、固定
<em>
等待
</em>
时间 脚本运行到此处时，固定停留某一时间。在脚本调试时比较常用。Java示例代码如下：public static void main(String[] args) throws Exception {
使用Sleep方法，就是去新建一个线程，然后里边放一个Thread.sleep()方法，这也是比较通俗的做法。但在main方法里直接加入Thread.sleep()，是对main线程的休眠使用 Java API 提供的Timer类，来实现。Timer timer=new Timer();
TimerTask task=new TimerTask(){
public void run(){
习题1：删除文本中的字母要求：把一个文本文档的前5行中包含字母的行删除掉，同时把6到10行中的全部字母删除掉（文件1.txt，行数大于10行）参考答案：#!/bin/bash
#date:2018年2月9日
sfile="/root/2.txt"
N=`cat $sfile|wc -l`
for i in `seq 1
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