Just_task

[HuangHongRui]

博客地点：🍠

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console.log(1+1); 控制台： 2； console.log("2"+"4");控制台：字符串“6” console.log(2+"4");控制台：字符串“24” console.log(+"4");控制台：4；

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var a = 1; // 声明 a = 1 a+++a; // (a++)+a 结果：2 typeof a+2;// (typeof a)+2 结果："number2"

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var a = 1; //声明 a = 1 var b = 3;//声明 b = 3 console.log( a+++b ); 控制台：(a++)+b 结果：4

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var arr = [3,4,5]

// for(i=0; i<arr.length; i++){ console.log (arr[i] * arr[i]) }

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var obj = { name: 'hunger', sex: 'male', age: 28 }

// for(x in obj){ console.log(x + ":" + obj[x]) }

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var a = 1, b = 2, c = 3; var val = typeof a + b || c >0 // "number2" console.log(val)

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var d = 5; var data = d ==5 && console.log('bb') //bb console.log(data)

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var data2 = d = 0 || console.log('haha') //haha console.log(data2)

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var x = !!"Hello" + (!"world", !!"from here!!"); // 2 console.log(x)