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
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);
/*result:
["T:17", "h:7", "i:9", "s:10", "e:14", "c:5", "o:8", "n:3", "f:3", "d:3", "a:9", "J:1", "v:1", "r:5", "p:4", "l:2", "g:3", "u:1", ",:1", "W:1", "b:1"]
*/
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