摘要：大胖騷胖大胖騷胖用來將字符串轉成對象的反序列化打印出用來將對象轉成字符串的序列化打印出大胖騷胖打印出打印出正則打印出打印出打印出打印出打印出打印出打印出打印出

es5_JSON

let str = "[{"name":"大胖","age":23},{"name":"騷胖","age":24}]";
        let arr = [
            {"name":"大胖","age":23},
            {"name":"騷胖","age":24}
            ];

用來將json字符串轉成json對象(json的反序列化)：

let jsonObj = JSON.parse(str);
       console.log(jsonObj);//打印出[Object, Object] 

用來將json對象轉成json字符串(json的序列化)：

let jsonStr = JSON.stringify(arr);
    console.log(jsonStr);//打印出[{"name":"大胖","age":23},{"name":"騷胖","age":24}]

String trim：

 let str5 = "       abc";
    console.log("|"+str5+"|");//打印出|       abc|
    console.log("|"+str5.trim()+"|");//打印出|abc|

正則：

 let reg = /^(s+)|(s+)$/g;
    console.log("|"+str5.replace(reg,"")+"|");//打印出|abc|

Date：

console.log(Date.now());//打印出1500706861909
console.log(new Date().toJSON());//打印出2017-07-22T07:01:01.909Z
console.log(new Date().toISOString().slice(0,10));//打印出2017-07-22

Number：

let a = new Number(1.326);
    let b = new Number(1.324);
    console.log(a.toFixed(2));//打印出1.33
    console.log(b.toFixed(2));//打印出1.32
    let c = 10000000000000;
    console.log(c.toPrecision(4));//打印出1.000e+13
    console.log(Math.round(12.34));//打印出12

function call apply：

var x = 1;
    let obj5 = {
        x:2
    }
    function fn1(a,b){
        console.log(this.x);
    }
    fn1();
    let fn2 = fn1.bind(obj5);
    fn2();