第一种方法
var str = "abcdef";
console.log( str.split("").reverse().join("") )；
第二种方法：
var str="abcdef"
var i=str.length;
i=i-1;
for (var x = i; x >=0; x--)
{
document.write(str.charAt(x));
}
第三种方法:
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