Part 32 supplement (32) string of ECMAScript

1、String

String Object's valueOf() Method 、toString() Method will return String The original value of the type .

2、 String length

//(1) String length 
var str = "fjfcjs"
console.log(str.length)
console.log("cjs".length)

3、 Access a single character

        //(2) Access a single character 
        //charAt(): Access the characters at the specified index position ;
        // Use the form of array subscript to access the array in the string 
        //charCodeAt(): Returns the Unicode

        var str1 = "zxcvbnm"
        console.log(str1.charAt(2))
        console.log(str1[0])
        console.log(str1.charCodeAt(0))

 4、 Find string

        //(3) Find string 
        //indexOf(): Retrieve the substring from the beginning of the string ( first ）
        //lastIndexOf(): Retrieve string from end of string （ the last one ）
        //searc