js中字符串替换及转换

js中单处替换

<script type="text/javascript">
var cityJson = "["北京","上海","深圳"]";
//替换后cityJson="["北京","上海","深圳"]";
cityJson = cityJson.replace("\"", "\"");
</script>

js中全部替换

<script type="text/javascript">
var cityJson = "["北京","上海","深圳"]";
//正则表达式两端必须加上/，默认只替换一处
//替换后cityJson="["北京","上海","深圳"]";
cityJson = cityJson.replace(/\"/, "\"");
</script>

<script type="text/javascript">
var cityJson = "["北京","上海","深圳"]";
//正则表达式两端必须加上/，末尾是/g可全部替换
//替换后cityJson="["北京","上海","深圳"]";
cityJson = cityJson.replace(/\"/, "\"");
</script>

js中普通字符串转换成Json

<script type="text/javascript">
var cityJson = "["北京","上海","深圳"]";
cityJson = cityJson.replace(/\"/, "\"");
//JSON.parse()可将普通字符串转换为Json字符串
//var array = ["北京","上海","深圳"];
var array = JSON.parse(cityJson);
for (var item in array) {
if (array[item] == "北京") {
role = "管理员";
}
}
</script>