javaScript的String.prototype的所有方法

var str="hello world";
str.charCodeAt(0);
>>>>>104(Number);

var str="hello",
    str2="world";
var str3=str.concat(str2);
>>>>>"helloworld";

var str="hello world";
str.endsWith("d");
>>>>>true

var str="hello world";
str.includes("he");
>>>>>>true
str.includes("hl");
>>>>>>false

str="hello world";
str.indexOf("l");
>>>>>>2
str.indexOf("z");
>>>>>>-1

var str="hello world";
str.lastIndexOf("l");
>>>>>>9
str.laseIndexOf("ll");
>>>>>>2

var str="hello world";
str.match(‘hello‘);
>>>>>>"hello"
str.match(/l+/g);
>>>>>>[‘ll‘,‘l‘]
var str="<input value={wwwww} type={222222} />";
var arr=str.match(/{(\w+)}/);
>>>>>>[‘{wwwww}‘,‘wwwww‘];
for(var i in arr)console.log(i);
>>>>>>0,1,index,input

var str="lili";
str.repeat(2);
>>>>>>"lililili";

var str="hello world!";
str.replace("l",‘o‘);
>>>>>>"heolo world!";
str.replace(/l/g,"o");
>>>>>>"heooo worod";
str.replace(/l/g,function(){
   return "o";
})
>>>>>>"heooo worod";

var str="123456789.abcde";
console.log(str.search("."));//0 因为正则.匹配\n以外任意字符
console.log(str.indexOf("."));//9 只匹配字符串.
console.log(str.search("\\."));//9 
console.log(str.indexOf("\\."));//-1 匹配\. 所以不存在
console.log(str.search(/\./));  //9 正则匹配后.字符
console.log(str.indexOf(/\./)); //-1  相当于匹配‘/\./‘ 所以不存在

var str="hello world";
str.slice(0);
>>>>>>"hello world"
str.slice(0,-1);
>>>>>>"hello worl"
str.slice(2,1);
>>>>>>""

var str="hello world";
str.split("");
>>>>>>["h","e","l","l","o"," ","w","o","r","l","d"]
str.split(/\s+/,1);
>>>>>>["hello"]

var str="hello world";
str.substring(0,5);
>>>>>>"hello";
str.substring(0);
>>>>>>"hello world";

var str="hello world";
str.sbustr(0,5);
>>>>>>"hello"
str.substr(-1,5);
>>>>>>"world"
str.substr(0);
>>>>>>"hello world"

var str="hello world";
str.startsWith("hello");
>>>>>>true;