es5_JSON

摘要：大胖骚胖大胖骚胖用来将字符串转成对象的反序列化打印出用来将对象转成字符串的序列化打印出大胖骚胖打印出打印出正则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

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

用来将json字符串转成json对象(json的反序列化)：

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

用来将json对象转成json字符串(json的序列化)：

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

String trim：

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

正则：

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

Date：

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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：

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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：

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