== 0 || 1 / x === 1 / y; } else { // return true if both x AND y evaluate to NaN. // The only possibility for a variable to not be strictly equal to itself // is when that variable evaluates to NaN (example: Number.NaN, 0/0, NaN). // This checks for...
if (a instanceof Holder<String>) // Error 而且， getClass(www.czabjcfj.com/200319556.html) 方法返回的也是原始类型。Holder<String> s = new Holder<>();s.getClass(); // class xx.xx.Holder Holder<Integer> i = new Holder<>();i.getClass(); // class xx.xx.Holder 类型变量 不...
所有其他类型的值,都可以通过Boolean(variable)转换成true或者false。 转换规则: 某些时候变量会自动转换成Boolean,如if(variable)相当于if( Boolean(variable) ) 4. Number 可以表示整数或浮点数。0开头表示八进制,0x开头表示十六进制。 特殊值: Number.MIN_VALUE(最小值 Number.MAX_VALUE(最大值 Infinity(无穷大...
var firstRow = rows[0]; firstRow.getString("name", "").equals("Foo") js的使用: varprevRow=previous_result.getRows(); parent_job.setVariable("prevRow",prevRow); parent_job.setVariable("size",prevRow.size()); parent_job.setVariable("size1",prevRow.get(0).size()); parent_job.se...
js中比较字符串使用"==",没有equals方法。 //求和,要求a,b数据类型必须为数字,不能为其他类型 //sum作用只是求和 functionsum(a,b){ if(typeofa=="number"&&typeofb=="number"){ returna+b; } alert(a+","+b+"必须都为数字!"); }
// Global variable referenced by following function.// If we had another function that used this name, now it'd be an array and it could break it.varname='Ryan McDermott';functionsplitIntoFirstAndLastName(){name=name.split(' ');}splitIntoFirstAndLastName();console.log(name);// ['Ryan...
var x=‘string’; However, there are other ways to assign variables in JavaScript, depending on the context. For example, each of the following is valid JavaScript for assigning a string to a variable: x=‘string’; x=“string”; (x)=(‘string’); this.x=‘string’; x={‘a’:’...
If the two values are not of the same type, the comparison will return false.typeof Operator: The typeof operator is used to check the data type of a variable. While it's generally reliable, there are certain quirks, like how typeof null returns "object" instead of "null", due to ...
title String|null|undefined Describes the variable driving the visualization. This is displayed as the title of the categories in the Legend and takes precedence over a field alias or valueExpressionTitle. Example renderer.legendOptions = { title: "Classification" }; orderByClassesEnabled Property...
The Error object returned if an error occurred while loading. Default Value:null loadStatus Property loadStatus Stringreadonly Represents the status of a load operation. ValueDescription not-loaded The object's resources have not loaded. loading The object's resources are currently loading. load...