js基础测试41

[HaveYuan]

    ```javascript
    //第1题
    let strTel1 = '13208033621 ';
    strTel1 = strTel1.replace(/(^\s*)|(\s*$)/g, "");

    //第2题
    let strTel2 = '１３２０８０３３６２１';
    let newStrTel = change(strTel2);

    function change(strTel) {
        let newNum = '';
        for(let i=0; i<strTel.length; i++) {
            newNum = newNum + String.fromCharCode(strTel.charCodeAt(i)-65248)
        }
        return newNum;
    }
    
    //第3题
    let strTel3 = '+8613208033621';
    let re3 = /^\+86/g;
    strTel3 = strTel3.replace(re3,'');

    //第4题
    let strTel4 = '132-0803 3621';
    let re4 = /\s|-/g;
    strTel4 = strTel4.replace(re4, '');
    
    //第5题
    let re5 = /^1[0-9]{10}/g;
    ```

[zhangxinxu]

请在这个下面回复：#54