2021-08-21-C站初级考试C1-模拟试卷编程题解析-05_codewave初级考试

结果

    var str = "There are surprises dlrow olleh in the tasks you are going to accomplish."
    str1 = str.substr(20,11)
    // console.log(str1.length)
    // console.log(str1)
    str1=str1.split("").reverse().join("").toUpperCase()
    str0=str.substr(0,20)
    str2=str.substr(31,str.length-31)
    str3=str0+str2+str1
    console.log(str3)
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substr取出相应位置的字符串，对指定的20~30位字符串进行转换数组、反转、转大写、再合并操作