function getYourString(s) {
var res = '';
var length = s.length;
for (var i = 0, j = 1; i < length; i , j ) {
//每到达5次，添加一个换行标签
if (j && j % 6 == 0) {
res = '<br />';
} else {
res = s[i];
}
}
return res;
}
var test = '123456534545435435435';
document.write(getYourString(test));
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