Powershell里怎么使用单引号君'和双引号君"及单引号君的弟弟反单引号君`呢？
规则1. 单引号（所见即所得）
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| Write-Host 'haha'
# haha
$a = 2
Write-Host '1 + 1 = $a'
# 1 + 1 = $a
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规则2. 双引号（代换内部变量）
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| Write-Host "haha"
# haha
$a = 2
Write-Host "1 + 1 = $a"
# 1 + 1 = 2
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规则3. 反单引号（取消变量代换，转义字符，换行连接符）
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| #取消变量代换
$a = 2
Write-Host "1 + 1 = `$a"
# 1 + 1 = $a
#转义字符
Write-Host "I said: `"Hello Bug~`""
# I said: "Hello Bug~"
#换行连接符
$a = 1 + `
2
Write-Host $a
# 3
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规则4. 想输出，写两遍
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| #双引号里的单引号，单引号里的双引号，都直接写就可以输出了
Write-Host "ha'ha"
# ha'ha
Write-Host 'ha"ha'
# ha"ha
#双引号里的双引号，单引号里的单引号，写两遍就可以输出了
Write-Host "ha""ha"
# ha"ha
Write-Host 'ha''ha'
# ha'ha
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