如何获得一个字符串列表指数

var str = "a,b,c,d,e,f,g";

 

function getIndexOf(srcString, searchString) {

	var str2Array = srcString.split(',');

	var array2Index = [];

	for(var i = 0; i < str2Array.length; i++) {

		array2Index[str2Array[i]] = i;

	}

	return (typeof array2Index[searchString] != 'undefined' ? array2Index[searchString] : -1);

}

 

alert(getIndexOf(str,'a'));

alert(getIndexOf(str,'d'));

alert(getIndexOf(str,'g'));

alert(getIndexOf(str,'not found'));