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  • 数据类型转换

     

      // 1 把数字转换成字符串类型  toString()
            // var num = 10;
            // var str = num.toString();
            // console.log(str);
            // console.log(typeof str);
            // // 2 Sting()

            // console.log(String(num));

            // // 3  拼接
            // console.log(num + '');


            // var age = prompt('年龄:');
            //  转整型
            // console.log(parseInt(age));

            // console.log(parseInt('3.14')); // 3取整
            // console.log(parseInt('3.94')); // 3取整 
            // console.log(parseInt('120px')); // 120 会去掉px 单位



            //  2  parseFloat  
            // console.log(parseFloat('3.14')); //3.14
            // console.log(parseFloat('3.141593')); //3.141593
            // console.log(parseFloat('99')); //99
            // console.log(parseFloat('120px')); //120  会去掉px 单位

            // 3 number 

            // var str = '124';
            // console.log(Number(str)); // 124
            // console.log(Number('120.23423')); // 120.23423

            //  4   -  * / 隐式转换
            console.log('12' - 0); //12
            console.log('12' * 1); // 12
            console.log('12' / 1); // 12 
            console.log('12' - '1'); // 11
            console.log('12' + '1'); // 121
     
     
     

     

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  • 原文地址:https://www.cnblogs.com/ericblog1992/p/13039840.html
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