Js to determine whether js functions variables exist or not simple sample code
- 2020-03-30 02:13:45
- OfStack
The core code
//Does the specified function exist
function isExitsFunction(funcName) {
try {
if (typeof(eval(funcName)) == "function") {
return true;
}
} catch(e) {}
return false;
}
//Whether the specified variable exists
function isExitsVariable(variableName) {
try {
if (typeof(variableName) == "undefined") {
//alert("value is undefined");
return false;
} else {
//alert("value is true");
return true;
}
} catch(e) {}
return false;
}
More judgment can be found in this article: (link: #)