//剪切字符串
function strCut(str, len){
var strlen = str.length;
if(strlen == 0) return false;
var j = Math.ceil(strlen / len);
var arr = Array();
for(var i=0; i<j; i++)
arr[i] = str.substr(i*len, len)
return arr;
}原文：http://ashbur.blog.51cto.com/5392709/1616696