代码如下:
复制代码 代码如下:
function numInstring(str){
str=str.replace(/ /ig,"");
var strArr=str.split("");
var result=[],beforeLength,afterLength,reg;
for(var i=0;i<strArr.length;i++){
if(str.indexOf(strArr[i])!=-1){
beforeLength=str.length;
reg=new RegExp(strArr[i],"ig");
str=str.replace(reg,"");
afterLength=str.length;
result.push(strArr[i]+":"+(beforeLength-afterLength));
}
}
return result;
}
var result=numInstring("This section of the site is dedicated to the JavaScript language itself, the parts that are not specific to Web pages or other host");
console.log(result);
网站建设 IT知识 IT知识教程 JavaScript计算字符串中每个字符出现次数的小例子 
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