06 Math&Date&Json

Math&Date&Json

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    <h1>Math</ H1 of > 
    < Script type = "text / JavaScript" > 
        var m =  3.1415926 ;
         //   Math.ceil () rounding up, 'ceiling function' is applied to a multi-page page count 
        console.log (Math.ceil ( m));   // . 4 

        //   Math.floor rounding down, 'floor function' 
        the console.log (Math.floor (m));   // . 3 

        //   average of two numbers of maxima and minima 
        var a =  18 is ; B =  25 ; 
        the console.log (Math.max (A, B)); 
        the console.log (Math.min (A, B)); 

        //   random number Math.random () in the range [0, 1)
        the console.log (Math.random ());
         //   randomly [100, 1000] integer 
        the console.log (Math.ceil ( 100  + Math.random () * 900 ));
         //   randomly (100,1000 ) integers 
        the console.log (Math.floor ( 101  + Math.random () * 900 ));
     </ Script > 

    < h1 of > a date </ h1 of > 
    < Script type = "text / JavaScript" > 
        //   creation date objects 
        var MyDate =  new new a Date ();
        console.log (MyDate.toLocaleString ());   //   Returns the morning local time 2019/7/1 11:18:33 
        console.log (MyDate.Date);   // Returns the date and time according to local time 
        console.log (MyDate .getFullYear ());   // returns the full-year according to local time 
        console.log (MyDate.getMonth ());   // returns the month according to local time 
        console.log (MyDate.getDate ());   // returns the specified time according to local date of the first day of the month of 
        console.log (MyDate.getDay ());   // return 0 represents the day of the week according to local time Sunday 
        console.log (MyDate.getHours ());   // returns the hour according to local time 
        console .log (MyDate.getMinutes ());   // returns minutes according to the local time 
        console.log (MyDate.getSeconds ());  // returns to local time according to 
    </ Script > 

    < h1 of > Json </ h1 of > 
    < P > the JSON (the JavaScript Object Notation) is a lightweight data-interchange format, a fully language independent text format is ideal data exchange format. 
        Meanwhile, JavaScript JSON is a native format, which means that processing JSON data in JavaScript does not require any special API or toolkit. </ P > 
    < Script type = "text / JavaScript" > 
        // transition between the object and the json json string 
        var jsonStr =  ' { "name": "xiaoxiao", "Age": "18 is", "weight" : "60Kg"} ' ;
        " : " Xiaohong " , " Age " : " 28 " , " weight " : " 70Kg " }; 
        the console.log ( typeof   jsonStr, typeof jsonObj); 

        //   string objects transfected json 
        var newJsonObj = the JSON.parse (jsonStr) ; 
        the console.log (newJsonObj, typeof newJsonObj); 

        //   JSON object-string 
        var newJsonStr = the JSON.stringify (jsonObj); 
        the console.log (newJsonStr,typeof  newJsonStr);

        //  遍历 json对象
        for(var k in jsonObj){
            console.log(k + '  ' + jsonObj[k])
        }
        //  遍历 json数组
        var packAlex = [{"name":"xiaoxiao","age":"18","weight":"60Kg"}, {"name":"xiaohong","age":"28","weight":"70Kg"}];
        for(var i in packAlex){//遍历packJson 数组时，i为索引
           console.log(packAlex[i].name + " " + packAlex[i].weight);
        }
    </script>
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Math&Date&Json

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