问题描述
- .innerHTML+="there are "中，=前面怎么会有+号？
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>example</title> <style type="text/css"> pre{ border: thin solid black; } </style> </head> <body> <pre id="results"></pre> <img id="caomei"src="img/4d0df8064383e78d74e07014e7ccd0ee.jpg" name="image" alt="caomei"> <p id="tblock"> There are lots of different kinds of fruit.There are over 500 varieties of <span id="banana">banana</span> alone.By the time we add the countless types of apples,oranges,and other well-known fruit,we are faced with thousands of choices. </p> <img id="apple" src="img/63fddd61e1afe42e38c6ce76910be815.jpg" name="image" alt="apple"> <p> One of the most interesting aspects of fruit is the variety available in each country.I live near London,in an area which is known for its apples. </p> <img id="san" src="img/161026fa577b8f3aa88187bd67b546fd.jpg" alt="san" /> <script> var resultsElement=document.getElementById("results"); var elems=document.getElementById("tblock").getElementsByTagName("span"); resultsElement.innerHTML+="there are "+elems.length+" span elements(getelement方法) "; var elems2=document.getElementById("tblock").querySelectorAll("span"); resultsElement.innerHTML+="there are "+elems2.length+" span elements(getelement+css方法) "; var elems3=document.querySelectorAll("#tblock>span"); resultsElement.innerHTML+="there are "+elems3.length+" span elements(css选择器方法) "; </script> </body> </html>resultsElement.innerHTML+="there are "+elems3.length+" span elements(css选择器方法) ";这句里面，=前面怎么会有+号？
解决方案
+=表示保留之前的内容，并且把后面的附加上去。
光是+，之间的文字就没有了。
解决方案二：
就是字符串的累加啊，等价于innerHTML=innerHTML+"xxx".
解决方案三：
string += "abcd"; 等价于 string = string + "abcd";
解决方案四：
举个简答例子：
var a = 1;
a += 2;
console.log(a); // 结果是3，a += 2;就相当于 a = a +2;
望采纳！
解决方案五：
该信息为ASE 12.5的一个bug，bugid为722898......
答案就在这里：Cannot truncate table 'xxx' because there are one or more isolation level 0 scans, or REO
时间： 2024-09-15 19:36:06