javascript javascript字符串删除位置X处的一个字符并添加到开始
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javascript string remove a character at position X and add to start
提问by David19801
If I have a string and a number:
如果我有一个字符串和一个数字：
var str='Thisisabigstring';
var numb=7;
I'm trying to remove the character at position 'numb'from the string and then put it at the beginning of the string.
我试图'numb'从字符串中删除位置处的字符，然后将其放在字符串的开头。
Trying for output like:
尝试输出如下：
'aThisisbigstring';
How can I do this with javascript/jquery?
我怎样才能用 javascript/jquery 做到这一点？
采纳答案by Mateusz W
quick and dirty :)
又快又脏:)
var b = str.charAt(numb - 1) + str.substring(0, numb - 1) + str.substring(numb);
回答by sjngm
var str = "Thisisabigstring";
var numb=7;
var c = str.charAt(numb);
str = c + str.substr(0, numb) + str.substr(numb + 1);
回答by Sudhir Bastakoti
var s = "Thisisabigstring";
var index = 7;
var x = s.charAt(index) + s.substr(0, (index - 1)) + s.substr(index + 1);
alert(x);
回答by mR.idiOt
var testStr = your_Test_string;
var CharPosition = Ur_Char_Position;
var pullOutChar = testStr.charAt(CharPosition);
testStr = pullOutChar + str.substr(0, CharPosition) + str.substr(CharPosition + 1);
回答by James McLaughlin
Sometimes it's easier to convert a string to an Arraywhen doing things like this:
有时Array在执行以下操作时将字符串转换为 an 会更容易：
str = str.split('');
str.unshift(str.splice(numb - 1, 1));
str = str.join('');
回答by JuSchz
There is no function in javascript which do that. Try this :
javascript 中没有这样做的功能。试试这个 ：
String.prototype.replaceCharAt=function(index, char){return this.substr(0, index) + char + this.substr(index+char.length);}
回答by Leigh Ciechanowski
var x = str.substring(7,8);
str = x + str;
