Let’s pretend that JavaScript has a triple dot operator (...) that turns arrays into actual parameters. Such an operator would allow you to use Math.max() (see Other Functions) with arrays. In that case, the following two expressions would be equivalent: Math.max(...[13, 7, 30]) ...
展开语法 (Spread syntax), 可以在函数调用/数组构造时,将数组表达式或者 string 在语法层面展开;还可以在构造字面量对象时,将对象表达式按 key-value 的方式展开。(译者注: 字面量一般指 [1, 2, 3] 或者 {name: "mdn"} 这种简洁的构造方式)
“Unexpected early end of program.”:“程序不可预期的提前终止”, “A leading decimal point can be confused with a dot: ‘.{a}’.”:“‘{a}’前的点容易混淆成小数点”, “Use the array literal notation [].”:“使用数组的符号 []“, “Expected an operator and instead saw ‘{a}’.”...
A triple equals sign (===) is used to compare two values (seeEquality Operators). Comments There are two kinds of comments: Single-line comments via//extend tothe rest of the line. Here’s an example: vara=0;// init Multiline comments via/* */can extend over arbitraryranges of text...
JavaScript中的属性访问器使用点(。)或方括号([]),但不能同时使用两者。方括号允许计算属性访问。 代码语言:javascript 复制 varobj={foo:{bar:"baz",bar2:"baz2"}};vari=2;obj.[foo].[bar]// SyntaxError: missing name after . operatorobj.foo."bar"+i;// SyntaxError: missing name after . opera...
Selects the documents where the result of the query inside the $not operator do not match the query object. {$not: query} Usage var fdb = new ForerunnerDB(), db = fdb.db("test"), coll = db.collection("test"); coll.insert({ _id: 1, name: 'John Doe', group: [{ name: '...
If the mesh does not contain any components, or if a component does not specify any faces, then the vertex attributes are interpreted as if each consecutive vertex triple makes up a triangle. Properties position Float64Array Autocasts from Number[]|Float32Array A flat array of vertex ...
请参阅MDN上有关expressions and operators和statements的文档。
To avoid type coercion, use the triple-equals operator: 1 2 123 === '123'; // false 1 === true; // false There are also != and !== operators. JavaScript also has bitwise operations. If you want to use them, they're there. Control structures JavaScript has a similar set of con...
To avoid type coercion, use the triple-equals operator: > 1 === true false > true === true true There are also != and !== operators. JavaScript also has bitwise operations. If you want to use them, they're there. [edit] Control structures ...