var str = "I think of other ages that floated upon the stream of life and love and death";
var positions = [];
function searchSubStr(str,? subStr){
? ? var pos = str.indexOf(subStr);
? ? while(pos>-1){
? ? ? ? positions.push(pos);
? ? ? ? pos = str.indexOf(subStr,? pos+1);
? ? }
}
searchSubStr(str,"o");
原文：https://blog.csdn.net/yeoman92/article/details/54949048
