{ var cookie = cookies[i].split("="); if (cookie[0] === cookieName) { return true; } } return false; } // 调用函数检查名为"myCookie"的cookie是否存在 var cookieExists = checkCookie("myCookie"); if (cookieExists) { console.
/* check for a cookie */ if (document.cookie == "") { /* if a cookie is not found - alert user - change cookieexists field value to false */ alert("Cookies need to be enabled!"); /* If the user has Cookies disabled an alert will let him know that Cookies need to be enable...
); } else { console.log("Cookie still exists."); } 总结 通过上述步骤,你可以轻松地在JavaScript中删除服务设置的cookie。首先确定要删除的cookie名称,然后使用document.cookie属性来操作cookie,编写一个函数来设置cookie的过期时间为过去的时间并调用该函数,最后通过检查cookie是否存在来验证删除是否成功。
判断一个网络资源是否存在,是一个耗时不可确定行为,很有可能造成主线程卡顿 如果是传入了一个 url 路径,此路径是采用 // 或者 \\ 开头的,那可能这将会是一个网络路径,或者是一个 UNC 格式的路径...如果是前者,那确实很有可能让 System.IO.File.Exists 方法判断需要等待超时,导致了这个同步的判断文件是否存在...
offset=documents.cookie.indexOf(search)if(offset != -1) {//if cookie existsoffset +=search.length//set index of beginning of valueend = documents.cookie.indexOf(";", offset);//set index of end of cookie valueif(end == -1)
6. // Check if "key" exists in the storage 7. var value 8. if(!value){ 9. // if not - load the data from the server 10. value = load_data_from_server() 11. // and save it 12. $.jStorage.set("key",value); 13. } ...
JavaScript check if variable exists (is definedinitialized) - We can use typeof operator to check the variable is defined or not.
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checkCookie()这样写 [html]view plaincopy <!- function cc() { if (document.cookie== "") { alert("COOKIES need to be enabled!"); document.form1.cookieexists.value="false"; } else { document.Form1.cookieexists.value="true"; } } document.cookie='killme...
68.判断cookie是否可用 navigator.cookieEnabled;// 69.显示有模式的有页面的弹出窗口 function setbgcolor_onclick() { var color = showModalDialog("/mailpage/compose/colorsel.html",0,"help=0"); if (color != null) { document.compose.bgcolor.value = color; ...