Coding for Future in Lutsk. JavaScript. Part 3
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仆仂于仆 仂仗亠舒仂亳, 仗仂亳亠 仂仗亠舒仂于, 仆从亠仄亠仆, 亟亠从亠仄亠仆, 仂仗亠舒仂亳 仗仂于仆礌仆, alert, prompt, confirm, 仄仂于仆 仂仗亠舒仂亳, if, if-else, "? :"
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Coding for Future in Lutsk. JavaScript. Part 3
- 1. 仆仂于仆 仂仗亠舒仂亳 丕仆舒仆 弍仆舒仆 仂仗亠舒仂亳 丕仆舒仆 仄舒ﾑ 仂亟亳仆 舒亞仄亠仆 (仂仗亠舒仆亟), 弍仆舒仆 亟于舒. 丐仂亶 舒仄亳亶 仂仗亠舒仂 仄仂亢亠 弍亳 仆舒仆亳仄 弍仆舒仆亳仄: x = -x; z = z - x;
- 2. 仂亟舒于舒仆仆 亳亠仍 磲从于, 仗亠亠于仂亠仆仆 亳仗于 var x = 1, y = 2; alert( x + y); // 3 var a = "亳亶" + "于仂于从"; alert( a ); // 亳亶于仂于从 !亠亰 仗仂弍仍舒! alert( '1' + 2 ); // "12" alert( 2 + '1' ); // "21"
- 3. + 仄仂亢亠 仗亠亠于仂ﾐ火委亳 亳仍仂 于 磲仂从, 仆 舒亳仄亠亳仆 仂仗亠舒仂亳 仍从亳 磲从亳 于 亳仍舒 alert( 2 - '1' ); // 1 alert( 6 / '2' ); // 3 var one = "1"; var two = "2"; alert( one + two ); // "12", 亟仂亟舒ﾑ 磲从亳 alert( +one + +two ); // 3
- 4. 仂亳亠 仂仗亠舒仂于 16 Unary Plus + Unary Negation - Prefix Increment ++ Prefix Decrement -- typeof typeof 15 Exponentiation ** 14 Multiplication * Division / Remainder % 13 Addition + Subtraction - 3 Assignment = += -= **= *= /=
- 5. 仆从亠仄亠仆/亟亠从亠仄亠仆: ++, -- var i = 1; var a = ++i; alert(a); // 2 var i = 1; var a = i++; alert(a); // 1
- 6. 弌从仂仂亠仆舒 舒亳仄亠亳从舒 var n = 2; n = n + 5; // n = 7 n = n * 2; // n = 14 var n = 2; n += 5; n *= 2; alert( n ); // 14
- 7. 舒亟舒舒 6 仂亰弍亠 仆舒仗仆亳亶 从仂亟: var a = b = 1, c, d; c = ++a; alert(c); d = b++; alert(d); c = (2+ ++a); alert(c); d = (2+ b++); alert(d);
- 8. 舒亟舒舒 7 亊从仂亞仂 亰仆舒亠仆仆 仆舒弍亟 a x? var a = 2; var x = 1 + (a *= 2);
- 9. 仗亠舒仂亳 仗仂于仆礌仆 >, < >=, <= == != 仂亞仆 亰仆舒亠仆仆 true false
- 10. 亳从仍舒亟 var a = true; var b = 3 > 4; // b = false alert( b ); // false alert( a != b ); // (true != false) 仗舒于亳仍仆仂, 于亳于亠亟亠 true
- 11. 仂于仆礌仆 磲从于 仂于仆ﾑﾑ 仗仂亳仄于仂仍仆仂. 亳 仂仄: 'A' < 'B'<...<'a'<...<'舒'<'弍' 亳从仍舒亟亳: alert( '从仍仂亞舒仄' > '亞舒仄' ); // true alert( '仄亠' > '舒仆亳仄亠' ); // false alert( '从仍仂仄亠' > '从仍仂亞舒仄' ); // true alert( '亞舒仄舒亳从舒' > '亞舒仄' ); // true, 弍仂 '舒' > 仆亢 束仆仂亞仂損
- 12. 舒亟舒舒 8 亊从亳仄 弍亟亠 亠亰仍舒? alert( "2" > "14" ); alert( +"2" > +"14" );
- 13. 亰舒仄仂亟 亰 从仂亳于舒亠仄: alert, prompt, confirmalert(仗仂于亟仂仄仍亠仆仆); alert( "亳于" + User ); result = prompt(title, default); var years = prompt('舒 于从?', 20); alert('舒仄 ' + years + ' 仂从于'); 亳 仆舒亳从舒仆仆 Esc 仗仂于亠舒 null. result = confirm(question); var isHungry = confirm("丱仂亠亠 亳?"); alert( isHungry );
- 14. 舒亟舒舒 9 弌于仂 仂仆从, 磻舒 亰舒仗亳 从仂亳于舒舒 亶仂亞仂 仄 于舒 亰 仆亳仄.
- 15. 丕仄仂于仆 仂仗亠舒仂亳: if, '?' if (仄仂于舒) 从仂仄舒仆亟舒 舒弍仂 if (仄仂于舒) { 从仂仄舒仆亟亳 } 丕仄仂于舒 仍仂亞仆亠 亰仆舒亠仆仆 舒弍仂 仗亳于仂亟亳 亟仂 仍仂亞仆仂亞仂 亰仆舒亠仆仆. 0, "", null, undefined, NaN false 亠 仆亠 - true
- 16. if - else var year = prompt('亊从亳亶 亰舒舒亰 从?', ''); if (year == 2017) { alert( '舒于亳仍仆仂!' ); } else { alert( '亠仗舒于亳仍仆仂!' ); }
- 17. else if var userMass = prompt('舒舒 仄舒舒?', ''); if (userMass < 50) { alert( '弌仂亟-仆仂 仗仂亳' ); } else if (userMass > 120) { alert( '弌亟舒亶亠 仆舒 亟' ); } else { alert( ' 亶 仆仂仄舒仍仆仂' ); }
- 18. 丐亠仆舒仆亳亶 仂仗亠舒仂 ? : 仄仂于舒 ? 亰仆舒亠仆仆1 : 亰仆舒亠仆仆2 access = (age > 14) ? true : false; 亠 舒仄亠, 仂 if (age > 14) { access = true; } else { access = false; }
- 19. 舒亟舒舒 10 丼亳 于亳于亠亟亠 alert? if ("0") { alert( '亳于' ); }
- 20. 舒亟舒舒 11 舒 亟仂仗仂仄仂亞仂 从仂仆从 if..else 仆舒仗亳 从仂亟, 磻亳亶 仂亳仄 亰仆舒亠仆仆 prompt, 舒 仗仂仄 于亳于仂亟亳 alert: 1, 磻仂 亰仆舒亠仆仆 >0, -1, 磻仂 <0, 0, 磻仂 亰仆舒亠仆仆 =0.