Detailed explanation of conversion between JS numbers and strings
This article mainly brings you a brief explanation of examples of conversion between JS numbers and strings. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.
Convert string to number
1 parseInt() function
parseInt() function parses from the beginning of string and returns an integer
parseInt('123'): Returns 123;
parseInt('1234xxx'): returns 1234;
parseInt('123.456'): returns 123;
parseInt('1 2 3'): returns 1; in the case of string, since Will return the first number
parseInt('bb cc 12'): Return NaN; if the first string is not a number, return nan
parseInt('123' 321): Return 321;
parseInt( "AF", 16); returns 175; it will automatically convert binary hexadecimal to octal into numbers
If the number cannot be parsed, a NaN value will be returned. You can use the isNaN() function to Detection;
parseFloat() will only return decimals
2 characters preceded by "+"
var n =+"123": return 123
3 characters plus "*"
var n ="123"*1: return 123
4 Add string array splitting
var arr = str.split(", ") A string group is divided into multiple by using
b = a.join("-");- is the specified separator, you can convert the array into a string at will
5 Adding a string and a number returns a string
console.log(12+"12"):返回"1212" console.log('12' + '34')返回'1234' console.log('12' + 34 ) 返回'1234' console.log(12 + '34''）返回1234' console.log(12 + 34 ) 返回46
6 When adding a string and multiple numbers, expand them with brackets
("<img src='images/" + 2 + 1 + ".jpg'>") 返回("<img src='images/" + 21 + ".jpg'>")If you want to convert it to 3
("<img src='images/" + （2+1）+ ".jpg'>") 返回("<img src='images/" + 3 + ".jpg'>")If it is preceded by the addition of numbers, you can add the numbers first
var a = 10 + 20 + 'abc' + 'cd'; 返回a的值为:30abccd
7eval()If you want to perform string operations
eval("x=10;y=20;document.write(x*y)") 返回200
document.write(eval("2+2")) 返回4
var x=10
document.write(eval(x+17） 返回27Convert numbers to strings
1 tostring（） n = 100x = n.toString() => "100"或是（100）toString() //tostring（2/16/8）还可以实现进制的转化
2 Number + any string ""
var n = 1234;var nn = 1234+"" -------------------------------------------------
About the string
Determine whether the string contains and returns the subscript. If it does not contain, return -1
var i = str.indexOf("x")The string of the last subscripted string
var i = str .lastIndexOf("")Convert to uppercase and lowercase
str.toUpperCase() 转大写 str.tolowerCase() 转小写
Intercept string string.substr ("Start from", "Intercept a few" )
str.substr(0,5) <body>
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