最初のメソッド
var str = "abcdef" ;
console.log( str.split("").reverse().join("") );
2 番目のメソッド:
var str="abcdef"
var i=str.length; =i- 1;
for (var x = i; x >=0; x--)
{
document.write(str.charAt(x)); >
3 番目の方法:
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