JavaScript Operator operator precedence Contributors to this page:fscholz,sparty02,michaelficarra,Jib,Ende93,zjmiller,pallxk,Mojoman,AlexChao,poeemah,artazor,BlindWanderer,rvighne,Bergi,rajashree396,sonali6105,MattBrubeck,kscarfone,PointedEars,Sheppy,DeepThought,Joshua-S,ethertank,Wladimir_Palant,jack...
Comma operator (,) You can enterindirect evalwith this technique, because direct eval requires the function call to happen on the reference to theeval()function. js globalThis.isDirectEval=false;{constisDirectEval=true;console.log(eval("isDirectEval"));// trueconsole.log((eval)("isDirect...
The parentheses are needed because of operator precedence. Indeed -- and the glaring issue of operator precedent only gets worse as I found in my discussion here: ExtendScript Throws on Nested Ternary Operator Since I don't control the JavaScript output easily (see the link above and here)...
在一个表达式中进行多个运算时,每一部分都会按预先确定的顺序进行计算求解,这个顺序被称为运算符优先级。括号可改变优先级的顺序,强制优先处理表达式的某部分。括号内的操作总是比括号外的操作先被执行。但是在括号内,仍保持正常的运算符优先级。 当表达式有多种运算符时,先处理算术运算符,接着处理比较运算符,然后...
Because commas have the lowest precedence— even lower than assignment — commas can be used to join multiple assignment expressions. In the following example, a is set to the value of b = 3 (which is 3). Then, the c = 4 expression evaluates and its result becomes the return value of...
Comma operator (,) You can enterindirect evalwith this technique, because direct eval requires the function call to happen on the reference to theeval()function. js globalThis.isDirectEval=false;{constisDirectEval=true;console.log(eval("isDirectEval"));// trueconsole.log((eval)("isDirect...
Because commas have the lowest precedence— even lower than assignment — commas can be used to join multiple assignment expressions. In the following example, a is set to the value of b = 3 (which is 3). Then, the c = 4 expression evaluates and its result becomes the return value of...
运算符的优先级决定了表达式中运算执行的先后顺序,优先级高的运算符最先被执行。 下面是一个简单的例子: 3 + 4 * 5 // 计算结果为23 乘法运算符 ("*")比起加法运算符("+")有着更高的优先级,所以它会被最先执行。 结合性 结合性决定了拥有相同优先级的运算符的执行顺序。考虑下面这个表达式: ...
Because commas have the lowest precedence— even lower than assignment — commas can be used to join multiple assignment expressions. In the following example, a is set to the value of b = 3 (which is 3). Then, the c = 4 expression evaluates and its result becomes the return value of...
Because commas have the lowest precedence— even lower than assignment — commas can be used to join multiple assignment expressions. In the following example, a is set to the value of b = 3 (which is 3). Then, the c = 4 expression evaluates and its result becomes the return value of...