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<h1>EL expression</h1>
Four arithmetic operations ${2+5 }<br>
Constant output: ${2+5 }<br>
Equal to 2==2: ${2==2 } , ${2 eq 2 }<br>
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Not equal to 5 != 5: ${5 != 5 } ,${5 ne 5 }
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Take the remainder: ${10%3 },${10 mod 3 }
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Less than: ${5<2 } ,${5 lt 2 }
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Greater than: ${5 > 10 }
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Less than or equal to: ${5 <= 10 }
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Greater than or equal to: ${5>=3 }
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逻辑与：${ true && true },${true and true }
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Logical OR: ${false || false } , ${false or false }
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Logical NOT: ${!true } ,${not true }
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判空：${empty "" }
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非空：${empty not "" }
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The general way of writing an EL expression:
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